lib: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding multiple break statements instead of
letting the code fall through to the next case, and by replacing a
number of /* fall through */ comments with the new pseudo-keyword
macro fallthrough.

Notice that Clang doesn't recognize /* Fall through */ comments as
implicit fall-through markings.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/cmdline.c b/lib/cmdline.c
index 55768b4f3f58..d11fdc579170 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -153,6 +153,7 @@ unsigned long long memparse(const char *ptr, char **retptr)
 	case 'k':
 		ret <<= 10;
 		endptr++;
+		fallthrough;
 	default:
 		break;
 	}