i915: alloc_oa_regs(): get rid of pointless access_ok()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/gpu/drm/i915/i915_perf.c

@@ -3949,9 +3949,6 @@ static struct i915_oa_reg *alloc_oa_regs(struct i915_perf *perf,
 	if (!n_regs)
 		return NULL;
 
-	if (!access_ok(regs, n_regs * sizeof(u32) * 2))
-		return ERR_PTR(-EFAULT);
-
 	/* No is_valid function means we're not allowing any register to be programmed. */
 	GEM_BUG_ON(!is_valid);
 	if (!is_valid)