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

crypto/openssl_util.cc

Index: crypto/openssl_util.cc
diff --git a/crypto/openssl_util.cc b/crypto/openssl_util.cc
index 8ea12323a92726fa9c6a421bf203c6d653920b83..964d83b84331791ad5b0e5f487734811a3526e8c 100644
--- a/crypto/openssl_util.cc
+++ b/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;