don't ignore left-curly-braces when searching for the end of a variable/function reference; match them up with right-curly-braces so we choose the proper brace to end the reference (will still fail to parse properly if the reference contains unbalanced braces)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@21235 65c4cc65-6c06-0410-ace0-fbb531ad65f3

pbx.c

@@ -1343,10 +1343,12 @@ static void pbx_substitute_variables_helper_full(struct ast_channel *c, struct v
 			needsub = 0;
 
 			/* Find the end of it */
-			while(brackets && *vare) {
+			while (brackets && *vare) {
 				if ((vare[0] == '$') && (vare[1] == '{')) {
 					needsub++;
 					brackets++;
+				} else if (vare[0] == '{') {
+					brackets++;
 				} else if (vare[0] == '}') {
 					brackets--;
 				} else if ((vare[0] == '$') && (vare[1] == '['))