fixes some memory leaks and redundant conditions

(closes issue #15269)
Reported by: contactmayankjain
Patches:
      patch.txt uploaded by contactmayankjain (license 740)
      memory_leak_stuff.trunk.diff uploaded by dvossel (license 671)
Tested by: contactmayankjain, dvossel




git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@201678 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/misdn/isdn_lib.c

@@ -2341,6 +2341,10 @@ static void misdn_save_data(int id, char *p1, int l1, char *p2, int l2)
 
 	if (!rx || !tx) {
 		cb_log(0,0,"Couldn't open files: %s\n",strerror(errno));
+		if (rx)
+			fclose(rx);
+		if (tx)
+			fclose(tx);
 		return ;
 	}