tpm: Fix fault in case CONFIG_DM_TPM is set without any TPM

In case CONFIG_DM_TPM was set without any TPM chipset configured a fault
was generated (NULL pointer access).

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd/tpm.c b/cmd/tpm.c
index add6bfb416..6edf3e9dc3 100644
--- a/cmd/tpm.c
+++ b/cmd/tpm.c
@@ -448,7 +448,7 @@ static int get_tpm(struct udevice **devp)
 	int rc;
 
 	rc = uclass_first_device(UCLASS_TPM, devp);
-	if (rc) {
+	if (rc || !*devp) {
 		printf("Could not find TPM (ret=%d)\n", rc);
 		return CMD_RET_FAILURE;
 	}