selftests: ir: skip when lirc device doesn't exist.

Skip instead of fail when lirc device doesn't exist.
Signed-off-by: Shuah Khan <shuah@kernel.org>
Acked-by: Sean Young <sean@mess.org>
Signed-off-by: Shuah Khan <shuah@kernel.org>

tools/testing/selftests/ir/ir_loopback.c

@@ -76,7 +76,7 @@ int lirc_open(const char *rc)
 	}
 
 	if (!dent)
-		ksft_exit_fail_msg("cannot find lirc device for %s\n", rc);
+		ksft_exit_skip("cannot find lirc device for %s\n", rc);
 
 	closedir(d);