pipe-loader: handle memory allocation failure

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>

src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c

@@ -123,6 +123,9 @@ pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd,
    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
    int vendor_id, chip_id;
 
+   if (!ddev)
+      return FALSE;
+
    if (loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
       ddev->base.u.pci.vendor_id = vendor_id;

src/gallium/auxiliary/pipe-loader/pipe_loader_sw.c

@@ -58,6 +58,7 @@ pipe_loader_sw_probe(struct pipe_loader_device **devs, int ndev)
    for (i = 0; i < Elements(backends); i++) {
       if (i < ndev) {
          struct pipe_loader_sw_device *sdev = CALLOC_STRUCT(pipe_loader_sw_device);
+	 /* TODO: handle CALLOC_STRUCT failure */
 
          sdev->base.type = PIPE_LOADER_DEVICE_SOFTWARE;
          sdev->base.driver_name = "swrast";