Make more functions return a status.

src/platform/tpm_lite/src/tlcl/tlcl.c

Index: src/platform/tpm_lite/src/tlcl/tlcl.c
diff --git a/src/platform/tpm_lite/src/tlcl/tlcl.c b/src/platform/tpm_lite/src/tlcl/tlcl.c
index 5afe83e30cb74d810b81b3c66a7bc772af4aee96..3d34d6c32b551dbf5b668b69258fd08d57ea9d0a 100644
--- a/src/platform/tpm_lite/src/tlcl/tlcl.c
+++ b/src/platform/tpm_lite/src/tlcl/tlcl.c
@@ -312,8 +312,10 @@ void TlclAssertPhysicalPresence(void) {
   Send(tpm_ppassert_cmd.buffer);
 }
 
-void TlclLockPhysicalPresence(void) {
-  Send(tpm_pplock_cmd.buffer);
+uint32_t TlclLockPhysicalPresence(void) {
+  uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE];
+  SendReceive(tpm_pplock_cmd.buffer, response, sizeof(response));
+  return TpmReturnCode(response);
 }
 
 void TlclSetNvLocked(void) {
@@ -372,8 +374,7 @@ int TlclGetFlags(uint8_t* disable, uint8_t* deactivated) {
   return result;
 }
 
-void TlclSetGlobalLock(void) {
+uint32_t TlclSetGlobalLock(void) {
   uint32_t x;
-  uint32_t result = TlclWrite(TPM_NV_INDEX0, (uint8_t*) &x, 0);
-  assert(result == TPM_SUCCESS);
+  return TlclWrite(TPM_NV_INDEX0, (uint8_t*) &x, 0);
 }