kmsan: apply clang-format to files mm/kmsan/

kmsan: apply clang-format to files mm/kmsan/

KMSAN source files are expected to be formatted with clang-format, fix
some nits that slipped in.  No functional change.

Link: https://lkml.kernel.org/r/20250507160012.3311104-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Bart van Assche <bvanassche@acm.org>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Macro Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>