security/tpm/tss/tcg-2.0/tss.c: Add debug message to tlcl_lib_init()

No message is reported in tlcl_lib_init() when tis_init() or tis_open()
returned an error value.
Add debug string.

BUG=N/A
TEST=Build binary and verified logging on Facebook FBG-1701

Change-Id: I522e488ddd3a1bd94a1a8c8470c757bd79c6d5c5
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33415
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/security/tpm/tss/tcg-2.0/tss.c b/src/security/tpm/tss/tcg-2.0/tss.c
index e579bff..c4b5538 100644
--- a/src/security/tpm/tss/tcg-2.0/tss.c
+++ b/src/security/tpm/tss/tcg-2.0/tss.c
@@ -181,10 +181,15 @@
 	if (done)
 		return VB2_SUCCESS;
 
-	if (tis_init())
+	if (tis_init()) {
+		printk(BIOS_ERR, "%s: tis_init returned error\n", __func__);
 		return VB2_ERROR_UNKNOWN;
-	if (tis_open())
+	}
+
+	if (tis_open()) {
+		printk(BIOS_ERR, "%s: tis_open returned error\n", __func__);
 		return VB2_ERROR_UNKNOWN;
+	}
 
 	car_set_var(tlcl_init_done, 1);