kmsdrm: Fixed crashes if allocating memory failed.

src/video/kmsdrm/SDL_kmsdrmopengles.c

@@ -102,6 +102,9 @@ KMSDRM_GLES_SwapWindow(_THIS, SDL_Window * window) {
     }
 
     fb_info = KMSDRM_FBFromBO(_this, wdata->next_bo);
+    if (fb_info == NULL) {
+        return 0;
+    }
     if (_this->egl_data->egl_swapinterval == 0) {
         /* Swap buffers instantly, possible tearing */
         /* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "drmModeSetCrtc(%d, %u, %u, 0, 0, &%u, 1, &%ux%u@%u)",

src/video/kmsdrm/SDL_kmsdrmvideo.c

@@ -199,6 +199,10 @@ KMSDRM_FBFromBO(_THIS, struct gbm_bo *bo)
 
     /* Here a new DRM FB must be created */
     fb_info = (KMSDRM_FBInfo *)SDL_calloc(1, sizeof(KMSDRM_FBInfo));
+    if (fb_info == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
     fb_info->drm_fd = vdata->drm_fd;
 
     w  = KMSDRM_gbm_bo_get_width(bo);
@@ -280,6 +284,10 @@ KMSDRM_VideoInit(_THIS)
 
     /* Open /dev/dri/cardNN */
     devname = (char *) SDL_calloc(1, 16);
+    if (devname == NULL) {
+        ret = SDL_OutOfMemory();
+        goto cleanup;
+    }
     SDL_snprintf(devname, 16, "/dev/dri/card%d", vdata->devindex);
     vdata->drm_fd = open(devname, O_RDWR | O_CLOEXEC);
     SDL_free(devname);