Merged revisions 270583 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r270583 | tilghman | 2010-06-15 13:25:12 -0500 (Tue, 15 Jun 2010) | 5 lines
  
  Variables have always been case-sensitive, so we should not be removing case-insensitive matches.
  
  Bug reported via the -dev list.  See
  http://lists.digium.com/pipermail/asterisk-dev/2010-June/044510.html
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@270584 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -9466,7 +9466,7 @@ int pbx_builtin_setvar_helper(struct ast_channel *chan, const char *name, const
 	}
 
 	AST_LIST_TRAVERSE_SAFE_BEGIN(headp, newvariable, entries) {
-		if (strcasecmp(ast_var_name(newvariable), nametail) == 0) {
+		if (strcmp(ast_var_name(newvariable), nametail) == 0) {
 			/* there is already such a variable, delete it */
 			AST_LIST_REMOVE_CURRENT(entries);
 			ast_var_delete(newvariable);