remove 4 lines of redundant code.

(closes issue #13080)
Reported by: gknispel_proformatique
Patches:
      trunk_ast_cdr_setapp.patch uploaded by gknispel (license 261)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@131012 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/cdr.c

@@ -785,10 +785,6 @@ void ast_cdr_setapp(struct ast_cdr *cdr, char *app, char *data)
 	for (; cdr; cdr = cdr->next) {
 		if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED)) {
 			check_post(cdr);
-			if (!app)
-				app = "";
-			if (!data)
-				data = "";
 			ast_copy_string(cdr->lastapp, S_OR(app, ""), sizeof(cdr->lastapp));
 			ast_copy_string(cdr->lastdata, S_OR(data, ""), sizeof(cdr->lastdata));
 		}