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In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning by replacing a /* Fall through */ comment with the new pseudo-keyword macro fallthrough; instead of letting the code fall through to the next case. 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> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/52931e343af25f6dab4bd1d604889d2594a861dd.1605896060.git.gustavoars@kernel.org