Fix integer overflow in FastUInt32ToBufferLeft

third_party/protobuf/src/google/protobuf/stubs/strutil.cc

Index: third_party/protobuf/src/google/protobuf/stubs/strutil.cc
diff --git a/third_party/protobuf/src/google/protobuf/stubs/strutil.cc b/third_party/protobuf/src/google/protobuf/stubs/strutil.cc
index 7ba92e8f1fa4d95dd77feb4a14abe6aa1326c1b7..85aa324eabfb4e53f6a4c97d458cf09370a96a13 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/strutil.cc
+++ b/third_party/protobuf/src/google/protobuf/stubs/strutil.cc
@@ -966,7 +966,7 @@ static const char two_ASCII_digits[100][2] = {
 };
 
 char* FastUInt32ToBufferLeft(uint32 u, char* buffer) {
-  int digits;
+  uint32 digits;
   const char *ASCII_digits = NULL;
   // The idea of this implementation is to trim the number of divides to as few
   // as possible by using multiplication and subtraction rather than mod (%),