app_voicemail: Fix phantom voicemail bug on rerecord

If users are able to press # for options while leaving
a message and then press 3 to rerecord the message, if
the caller hangs up during the rerecord prompt but before
Asterisk starts recording a message, then an "empty"
voicemail gets processed whereby an email gets sent out
notifying the user of a 0:00 duration message. The file
doesn't actually exist, so playback will fail since there
was no message to begin with.

This adds a check after the streaming of the rerecord
announcement to see if the caller has hung up. If so,
we bail out early so that we can clean up properly.

ASTERISK-29391 #close

Change-Id: Id965d72759a2fd3b39afb76fec08aaebebe75c31

apps/app_voicemail.c

@@ -15590,6 +15590,12 @@ static int play_record_review(struct ast_channel *chan, char *playfile, char *re
 				}
 				cmd = ast_play_and_wait(chan, "beep");
 			}
+			if (cmd == -1) {
+				/* User has hung up, no options to give */
+				ast_debug(1, "User hung up before message could be rerecorded\n");
+				ast_filedelete(tempfile, NULL);
+				return cmd;
+			}
 			recorded = 1;
 			/* After an attempt has been made to record message, we have to take care of INTRO and beep for incoming messages, but not for greetings */
 			if (record_gain)