io_uring: remove checks for NULL 'sq_offset'

Since the 5.12 kernel release, nobody has been passing NULL as the
sq_offset pointer. Remove the checks for it being NULL or not, it will
always be valid.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -2597,12 +2597,10 @@ static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries
 #endif
 
 	if (ctx->flags & IORING_SETUP_NO_SQARRAY) {
-		if (sq_offset)
 		*sq_offset = SIZE_MAX;
 		return off;
 	}
 
-	if (sq_offset)
 	*sq_offset = off;
 
 	sq_array_size = array_size(sizeof(u32), sq_entries);