clang compiler warnings: Fix -Wbitfield-constant-conversion warning

In chan_iax2, we attempt to assign a -1 to a bitfield. This gets caught by
clang, as it will truncate the -1 to a 1 implicitly.

Instead, we just assign the value a '1'.

Review: https://reviewboard.asterisk.org/r/4537/

ASTERISK-24917
Reported by: dkdegroot
patches:
  rb4537.patch submitted by dkdegroot (License 6600)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@433683 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -11996,7 +11996,7 @@ immediatedial:
 		if (iaxdebug && iaxs[fr->callno]) {
 			ast_debug(1, "Received out of order packet... (type=%u, subclass %d, ts = %u, last = %u)\n", f.frametype, f.subclass.integer, fr->ts, iaxs[fr->callno]->last);
 		}
-		fr->outoforder = -1;
+		fr->outoforder = 1;
 	}
 	fr->cacheable = ((f.frametype == AST_FRAME_VOICE) || (f.frametype == AST_FRAME_VIDEO));
 	if (iaxs[fr->callno]) {