Static code analysis housekeeping time... things that could be double-checked are...

Static code analysis housekeeping time... things that could be double-checked are marked with "[Note: some-comment]" :
if-if-else without curly braces [api/ApiQuerySiteinfo.php] --> adding
Unused global declaration:  $wgGroupPermissions --> removing
Unused global declaration:  $wgEmailConfirmToEdit (line 301) --> removing
Variable $id appears only once (line 1021)  --> removing
Variable $m was used before it was defined (line 805) --> defining.
Variable $retval was used before it was defined (line 2346) --> renaming to $result
Variable $rcid appears only once (line 244 of RecentChange.php)  --> using this instead of $change [Note: was left over from r24607 refactoring, revert if wrong please]
Unused global declaration:  $wgCommandLineMode (line 11) --> removing
Variable $k appears only once (line 132 of ImagePage.php) --> removing.
Variable $info appears only once (line 311 of ImagePage.php)  --> removing.
Unused global declaration:  $wgTitle (line 569 of ImagePage.php) -> removing.
Variable $handlerParams was used before it was defined (line 616 of Linker.php) --> resolved by Raymond in r24966
Variable $match was used before it was defined (line 1031 of Linker.php) --> defining.
Unused global declaration:  $wgEnotifWatchlist (line 253 of UserMailer.php) --> removing
Unused global declaration:  $wgShowUpdatedMarker (line 253 of UserMailer.php) --> removing
Variable $img appears only once (line 446 of SpecialUpload.php) --> added definition, defined as null, flagged with @todo  [Note: should $img be defined in this context, or is it intended to be null? And should the return value after the hook be checked in some way?]
Unused global declaration:  $wgEnableAPI (line 739 of SpecialUpload.php) --> removing.
Unused global declaration:  $wgNamespaceProtection (line 1030 of OutputPage.php) --> removing.
Unused global declaration:  $wgContLang (line 18 of SpecialWatchlist.php) --> removing.
Unused global declaration:  $wgRawHtml (line 269 of SpecialMovepage.php) --> removing.
The value of variable $page was never used (line 331 of SpecialUndelete.php) --> removing line, as $page gets redefined a few lines down.
Variable $synIndex appears only once (line 521 of MagicWord.php) --> commenting out.
Variable $case appears only once (line 539 of MagicWord.php) --> removing from foreach index key usage.
Variable $wgUser appears only once (line 1039 of Title.php) --> adding line to declare as a global, would be null otherwise.
Variable $m was used before it was defined (line 285 of Title.php) --> defining.
Variable $id appears only once (line 1150 of Title.php) --> removing from foreach index key usage.
Variable $subpage appears only once (line 1297 of Title.php) --> commenting out.
Variable $restrictions appears only once (line 1399 of Title.php) --> commenting out.
Variable $mime appears only once (line 210 of filerepo/OldLocalFile.php) --> removing.
Variable $deprefixedName appears only once (line 213 of filerepo/LocalFile.php) --> removing.
Variable $m appears only once (line 541 of filerepo/LocalFile.php) --> removing.
Variable $where appears only once (line 1245 of filerepo/LocalFile.php) --> removing.
Variable $info appears only once (line 1427 of filerepo/LocalFile.php) --> removing.
Variable $rel appears only once (line 138 of filerepo/RepoGroup.php) --> commenting out.
Variable $zone appears only once (line 138 of filerepo/RepoGroup.php) --> commenting out.
Variable $nbytes appears only once (line 208 of media/Generic.php) --> added a return line that uses $nbytes. [Note: I'm assuming that this was the intent]
Variable $offset appears only once (line 201 of SpecialListusers.php) --> removing.
Variable $limit appears only once (line 201 of SpecialListusers.php) --> removing.
Variable $groupTarget appears only once (line 203 of SpecialListusers.php) --> removing.
Unused global declaration:  $wgLang (line 74 of SpecialWantedpages.php) --> removing.
Variable $block appears only once (line 244 of SpecialProtectedpages.php) --> removing.
Variable $offset appears only once (line 281 of SpecialProtectedpages.php) --> removing.
Variable $limit appears only once (line 281 of SpecialProtectedpages.php) --> removing.
Unused global declaration:  $wgLang (line 30 of FileDeleteForm.php) --> removing.
Unused global declaration:  $wgServer (line 30 of FileDeleteForm.php) --> removing.