blkcg: annotate implicit fall through
There is a plan to build the kernel with -Wimplicit-fallthrough and this place in the code produced a warning (W=1). This commit remove the following warning: kernel/trace/blktrace.c:725:9: warning: this statement may fall through [-Wimplicit-fallthrough=] Signed-off-by: NMathieu Malaterre <malat@debian.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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