drm/i915: use pointer = k[cmz...]alloc(sizeof(*pointer), ...) pattern

Done while reviewing all our allocations for fubar. Also a few errant
cases of lacking () for the sizeof operator - just a bit of OCD.

I've left out all the conversions that also should use kcalloc from
this patch  (it's only 2).

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 79582f9..a6310ca 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1292,11 +1292,11 @@
 	struct intel_encoder *intel_encoder;
 	struct intel_connector *intel_connector;
 
-	intel_dig_port = kzalloc(sizeof(struct intel_digital_port), GFP_KERNEL);
+	intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
 	if (!intel_dig_port)
 		return;
 
-	intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
+	intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
 	if (!intel_connector) {
 		kfree(intel_dig_port);
 		return;