Use uint32_t to hold return values from ERR_get_error() and ERR_peek_error().

BUG=None

Review URL: https://codereview.chromium.org/1028873002

Cr-Commit-Position: refs/heads/master@{#321919}

crypto/openssl_util.cc

@@ -116,7 +116,7 @@ void EnsureOpenSSLInit() {
 
 void ClearOpenSSLERRStack(const tracked_objects::Location& location) {
   if (logging::DEBUG_MODE && VLOG_IS_ON(1)) {
-    int error_num = ERR_peek_error();
+    uint32_t error_num = ERR_peek_error();
     if (error_num == 0)
       return;
 

net/cert/test_root_certs_openssl.cc

@@ -17,7 +17,7 @@ namespace net {
 bool TestRootCerts::Add(X509Certificate* certificate) {
   if (!X509_STORE_add_cert(X509Certificate::cert_store(),
                            certificate->os_cert_handle())) {
-    unsigned long error_code = ERR_peek_error();
+    uint32_t error_code = ERR_peek_error();
     if (ERR_GET_LIB(error_code) != ERR_LIB_X509 ||
         ERR_GET_REASON(error_code) != X509_R_CERT_ALREADY_IN_HASH_TABLE) {
       crypto::ClearOpenSSLERRStack(FROM_HERE);

net/quic/crypto/aead_base_decrypter_openssl.cc

@@ -26,7 +26,7 @@ void DLogOpenSslErrors() {
 #ifdef NDEBUG
   ClearOpenSslErrors();
 #else
-  while (unsigned long error = ERR_get_error()) {
+  while (uint32_t error = ERR_get_error()) {
     char buf[120];
     ERR_error_string_n(error, buf, arraysize(buf));
     DLOG(ERROR) << "OpenSSL error: " << buf;

net/tools/flip_server/spdy_ssl.cc

@@ -103,7 +103,7 @@ SSL* CreateSSLContext(SSL_CTX* ssl_ctx) {
 
 void PrintSslError() {
   char buf[128];  // this buffer must be at least 120 chars long.
-  int error_num = ERR_get_error();
+  uint32_t error_num = ERR_get_error();
   while (error_num != 0) {
     ERR_error_string_n(error_num, buf, sizeof(buf));
     LOG(ERROR) << buf;