Revert change from revision 67064.

It is documented behavior that if a parking extension already exists while using PARKINGEXTEN,
 dialplan execution will continue.  If blind transferring to a Park with PARKINGEXTEN, you
 must keep this in mind, and handle the failure yourself.

Issue 11237, reported by jon.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89248 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_features.c

@@ -328,7 +328,7 @@ int ast_park_call(struct ast_channel *chan, struct ast_channel *peer, int timeou
 			ast_mutex_unlock(&parking_lock);
 			free(pu);
 			ast_log(LOG_WARNING, "Requested parking extension already exists: %s@%s\n", parkingexten, parking_con);
-			return -1; /* We failed to park this call, plain and simple so we need to error out */
+			return 0;	/* Continue execution if possible */
 		}
 		ast_copy_string(pu->parkingexten, parkingexten, sizeof(pu->parkingexten));
 		x = atoi(parkingexten);