kselftests: dmabuf-heaps: Softly fail if don't find a vgem device

While testing against a vgem device is helpful for testing importing
they aren't always configured in, so don't make it a fatal failure.

Cc: Shuah Khan <shuah@kernel.org>
Cc: Brian Starkey <brian.starkey@arm.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Laura Abbott <labbott@kernel.org>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: Daniel Mentz <danielmentz@google.com>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c

@@ -184,15 +184,14 @@ static int test_alloc_and_import(char *heap_name)
 	if (importer_fd < 0) {
 		ret = importer_fd;
 		printf("Failed to open vgem\n");
-		goto out;
-	}
-
-	ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
-	if (ret < 0) {
-		printf("Failed to import buffer\n");
-		goto out;
+	} else {
+		ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
+		if (ret < 0) {
+			printf("Failed to import buffer\n");
+			goto out;
+		}
+		printf("import passed\n");
 	}
-	printf("import passed\n");
 
 	ret = dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
 	if (ret < 0) {