vfio-pci/nvlink2: Fix ancient gcc warnings

Using the {0} construct as a generic initializer is perfectly fine in C,
however due to a bug in old gcc there is a warning:

  + /kisskb/src/drivers/vfio/pci/vfio_pci_nvlink2.c: warning: (near
initialization for 'cap.header') [-Wmissing-braces]:  => 181:9

Since for whatever reason we still want to compile the modern kernel
with such an old gcc without warnings, this changes the capabilities
initialization.

The gcc bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119

Fixes: 7f928917 ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci_nvlink2.c

@@ -174,11 +174,11 @@ static int vfio_pci_nvgpu_add_capability(struct vfio_pci_device *vdev,
 		struct vfio_pci_region *region, struct vfio_info_cap *caps)
 {
 	struct vfio_pci_nvgpu_data *data = region->data;
-	struct vfio_region_info_cap_nvlink2_ssatgt cap = { 0 };
-
-	cap.header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT;
-	cap.header.version = 1;
-	cap.tgt = data->gpu_tgt;
+	struct vfio_region_info_cap_nvlink2_ssatgt cap = {
+		.header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT,
+		.header.version = 1,
+		.tgt = data->gpu_tgt
+	};
 
 	return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
 }
@@ -361,18 +361,18 @@ static int vfio_pci_npu2_add_capability(struct vfio_pci_device *vdev,
 		struct vfio_pci_region *region, struct vfio_info_cap *caps)
 {
 	struct vfio_pci_npu2_data *data = region->data;
-	struct vfio_region_info_cap_nvlink2_ssatgt captgt = { 0 };
-	struct vfio_region_info_cap_nvlink2_lnkspd capspd = { 0 };
+	struct vfio_region_info_cap_nvlink2_ssatgt captgt = {
+		.header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT,
+		.header.version = 1,
+		.tgt = data->gpu_tgt
+	};
+	struct vfio_region_info_cap_nvlink2_lnkspd capspd = {
+		.header.id = VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD,
+		.header.version = 1,
+		.link_speed = data->link_speed
+	};
 	int ret;
 
-	captgt.header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT;
-	captgt.header.version = 1;
-	captgt.tgt = data->gpu_tgt;
-
-	capspd.header.id = VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD;
-	capspd.header.version = 1;
-	capspd.link_speed = data->link_speed;
-
 	ret = vfio_info_add_capability(caps, &captgt.header, sizeof(captgt));
 	if (ret)
 		return ret;