Address minor feedback

Author: aidangarske

examples/attestation/activate_credential.c

@@ -197,11 +197,13 @@ int TPM2_ActivateCredential_Example(void* userCtx, int argc, char *argv[])
             sizeof(activCredIn.credentialBlob.buffer)) {
         printf("Credential blob size %d exceeds buffer\n",
             activCredIn.credentialBlob.size);
+        rc = BAD_FUNC_ARG;
         goto exit;
     }
     if (activCredIn.secret.size > sizeof(activCredIn.secret.secret)) {
         printf("Secret size %d exceeds buffer\n",
             activCredIn.secret.size);
+        rc = BAD_FUNC_ARG;
         goto exit;
     }
 #else

examples/attestation/make_credential.c

@@ -158,6 +158,7 @@ int TPM2_MakeCredential_Example(void* userCtx, int argc, char *argv[])
     /* Set the object name */
     if (name.size > sizeof(makeCredIn.objectName.name)) {
         printf("Name size %d exceeds buffer\n", name.size);
+        rc = BAD_FUNC_ARG;
         goto exit;
     }
     makeCredIn.objectName.size = name.size;

examples/pcr/extend.c

@@ -163,6 +163,10 @@ int TPM2_PCR_Extend_Test(void* userCtx, int argc, char *argv[])
         XFCLOSE(fp);
         if (rc == 0)
             rc = wc_HashFinal(&dig, hashType, hash);
+        if (rc != 0) {
+            printf("Hash operation failed %d\n", rc);
+            goto exit;
+        }
 
         XMEMCPY(cmdIn.pcrExtend.digests.digests[0].digest.H,
                 hash, hashSz);

src/tpm2_linux.c

@@ -146,9 +146,14 @@ int TPM2_LINUX_SendCommand(TPM2_CTX* ctx, TPM2_Packet* packet)
                 }
                 else {
                 #ifdef DEBUG_WOLFTPM
-                    printf("Failed to read from %s (ret %zd): errno %d"
-                        " = %s\n", TPM2_LINUX_DEV, ret, errno,
-                        strerror(errno));
+                    if (ret == 0) {
+                        printf("Received EOF from %s\n", TPM2_LINUX_DEV);
+                    }
+                    else {
+                        printf("Failed to read from %s (ret %zd):"
+                            " errno %d = %s\n", TPM2_LINUX_DEV, ret,
+                            errno, strerror(errno));
+                    }
                 #endif
                     rc = TPM_RC_FAILURE;
                 }