Fix a silly mistake in a change I made yesterday that caused chan_iax2 to blow

up very quickly.
(issue #12515)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@114608 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -1353,7 +1353,7 @@ static int __find_callno(unsigned short callno, unsigned short dcallno, struct s
 					res = x;
 				}
 			}
-			if (res && !return_locked)
+			if (!res || (res && !return_locked))
 				ast_mutex_unlock(&iaxsl[x]);
 		}
 		for (x=TRUNK_CALL_START;(res < 1) && (x<maxtrunkcall);x++) {
@@ -1364,7 +1364,7 @@ static int __find_callno(unsigned short callno, unsigned short dcallno, struct s
 					res = x;
 				}
 			}
-			if (res && !return_locked)
+			if (!res || (res && !return_locked))
 				ast_mutex_unlock(&iaxsl[x]);
 		}
 	}