Fixes compile error in chan_phone for big endian

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@307927 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_phone.c

@@ -819,7 +819,7 @@ static int phone_write(struct ast_channel *ast, struct ast_frame *frame)
 		} else {
 			int swap = 0;
 #if __BYTE_ORDER == __BIG_ENDIAN
-			if (frame->subclass.codec == AST_FORMAT_SLINEAR)
+			if (frame->subclass.format.id == AST_FORMAT_SLINEAR)
 				swap = 1; /* Swap big-endian samples to little-endian as we copy */
 #endif
 			res = phone_write_buf(p, pos, expected, maxfr, swap);