mm/vmstat: revert "fix a W=1 clang compiler warning"

mm/vmstat: revert "fix a W=1 clang compiler warning"

Commit 75b5ab134bb5 enabled -Wenum-enum-conversion in W=1 builds.  Commit
30c2de0a267c ("mm/vmstat: fix a W=1 clang compiler warning") fixed a
-Wenum-enum-conversion warning.  Commit 8f6629c004b1 removed the
-Wenum-enum-conversion option again from W=1 builds.  Since the W=1
compiler warning fix is no longer necessary, revert it.

Link: https://lkml.kernel.org/r/20250211205911.1707684-1-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ivan Shapovalov <intelfx@intelfx.name>
Cc: David Laight <david.laight@aculab.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>