vfs: micro-optimize acl_permission_check()
It's a hot function, and we're better off not mixing types in the mask calculations. The compiler just ends up mixing 16-bit and 32-bit operations, for no good reason. So do everything in 'unsigned int' rather than mixing 'unsigned int' masking with a 'umode_t' (16-bit) mode variable. This, together with the parent commit (47a150ed: "Cache user_ns in struct cred") makes acl_permission_check() much nicer. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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