fix null string compiler warning

Signed-off-by: Keith Busch <kbusch@kernel.org>

diff --git a/nvme-rpmb.c b/nvme-rpmb.c
index 8ccb8b73c976134b45114d94760873ec2de77954..0c1b749718fc70f703d8c66aa8ecc10475143c4c 100644 (file)
--- a/nvme-rpmb.c
+++ b/nvme-rpmb.c
@@ -209,12 +209,12 @@ static void write_file(unsigned char *data, size_t len, const char *dir,
        if ((fp = fopen(temp_folder, "ab+")) != NULL) {
                if (fwrite(data, 1, len,  fp) != len) {
                        fprintf(stderr, "Failed to write %s data to %s\n",
-                                msg, temp_folder);
+                                msg ? msg : "", temp_folder);
                }
                fclose(fp);
        } else  {
                fprintf(stderr, "Failed to open %s file to write %s\n",
-                       temp_folder, msg);
+                       temp_folder, msg ? msg : "");
        }
 }