sq_ring_needs_enter(): force loading of kflags
sq_ring_needs_enter(): force loading of kflags

ring->sq.kflags is set by the kernel. Ensure the compiler always loads
the value from memory when doing the check.

Signed-off-by: Kornilios Kourtis <fbd1fdd48e316a736711a3b30106195507321a09@gmail.com>
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing