[for-linus][PATCH 2/5] tools/bootconfig: Fix a build error accroding to undefined fallthrough

From: Masami Hiramatsu <mhiramat@kernel.org>

Since the "fallthrough" is defined only in the kernel, building
lib/bootconfig.c as a part of user-space tools causes a build
error.

Add a dummy fallthrough to avoid the build error.

Link: https://lkml.kernel.org/r/162087519356.442660.11385099982318160180.stgit@devnote2

Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 4c1ca831adb1 ("Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/bootconfig/include/linux/bootconfig.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/bootconfig/include/linux/bootconfig.h b/tools/bootconfig/include/linux/bootconfig.h
index 078cbd2ba651..de7f30f99af3 100644
--- a/tools/bootconfig/include/linux/bootconfig.h
+++ b/tools/bootconfig/include/linux/bootconfig.h

@@ -4,4 +4,8 @@
 
 #include "../../../../include/linux/bootconfig.h"
 
+#ifndef fallthrough
+# define fallthrough
+#endif
+
 #endif

-- 
2.30.2