drm/i915: Fix computation of pitch for dumb bo creator

Cc: Dave Airlie <[e-mail]>
Signed-off-by: Chris Wilson <[e-mail]>

drivers/gpu/drm/i915/i915_gem.c

···
 		     struct drm_mode_create_dumb *args)
 {
 	/* have to work out size/pitch and return them */
-	args->pitch = ALIGN(args->width & ((args->bpp + 1) / 8), 64);
+	args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
 	args->size = args->pitch * args->height;
 	return i915_gem_create(file, dev,
 			       args->size, &args->handle);