drm/i915: selftest_lrc: Check the correct variable

We should check "request[n]" instead of just "request".

Fixes: 78e41ddd ("drm/i915: Apply an execution_mask to the virtual_engine")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190529110355.GA19119@mwanda

drivers/gpu/drm/i915/gt/selftest_lrc.c

@@ -1531,8 +1531,8 @@ static int mask_virtual_engine(struct drm_i915_private *i915,
 
 	for (n = 0; n < nsibling; n++) {
 		request[n] = i915_request_create(ve);
-		if (IS_ERR(request)) {
-			err = PTR_ERR(request);
+		if (IS_ERR(request[n])) {
+			err = PTR_ERR(request[n]);
 			nsibling = n;
 			goto out;
 		}