Merge pull request #1391 from no92/drm-returns

sysdeps/managarm: fix incorrect returns for some DRM ioctls

Author: Dennisbonke

sysdeps/managarm/generic/drm.cpp

@@ -1223,13 +1223,14 @@ int ioctl_drm(int fd, unsigned long request, void *arg, int *result, HelHandle h
 			mlibc::infoLogger() << "\e[35mmlibc: DRM_IOCTL_GEM_CLOSE"
 			                       " is a noop\e[39m"
 			                    << frg::endlog;
+			*result = 0;
 			return 0;
 		}
 		case DRM_IOCTL_WAIT_VBLANK: {
 			mlibc::infoLogger() << "\e[35mmlibc: DRM_IOCTL_WAIT_VBLANK"
 			                       " is a noop\e[39m"
 			                    << frg::endlog;
-			return 0;
+			return EOPNOTSUPP;
 		}
 		case DRM_IOCTL_PRIME_HANDLE_TO_FD: {
 			auto param = reinterpret_cast<drm_prime_handle *>(arg);