Fixing an error I made earlier. ast_fileexists can return -1 on failure, so I need to be sure that we only enter the if

statement if it is successful.

Related to my fix to issue #10186



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@75405 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -1771,7 +1771,7 @@ static int retrydial_exec(struct ast_channel *chan, void *data)
 		if (res == 0) {
 			if (ast_test_flag(&peerflags, OPT_DTMF_EXIT)) {
 				if (!ast_strlen_zero(announce)) {
-					if (ast_fileexists(announce, NULL, chan->language)) {
+					if (ast_fileexists(announce, NULL, chan->language) > 0) {
 						if(!(res = ast_streamfile(chan, announce, chan->language)))								
 							ast_waitstream(chan, AST_DIGIT_ANY);
 					} else
@@ -1784,7 +1784,7 @@ static int retrydial_exec(struct ast_channel *chan, void *data)
 				}
 			} else {
 				if (!ast_strlen_zero(announce)) {
-					if (ast_fileexists(announce, NULL, chan->language)) {
+					if (ast_fileexists(announce, NULL, chan->language) > 0) {
 						if (!(res = ast_streamfile(chan, announce, chan->language)))
 							res = ast_waitstream(chan, "");
 					} else