Bug 1719146 - Use size_t in breakpad's Linux exception handler. r=gsvelto

Differential Revision: https://phabricator.services.mozilla.com/D119083

toolkit/crashreporter/breakpad-client/linux/handler/exception_handler.cc

@@ -148,7 +148,7 @@ void InstallAlternateStackLocked() {
   // SIGSTKSZ may be too small to prevent the signal handlers from overrunning
   // the alternative stack. Ensure that the size of the alternative stack is
   // large enough.
-  static const unsigned kSigStackSize = std::max(16384, SIGSTKSZ);
+  static const size_t kSigStackSize = std::max(size_t(16384), size_t(SIGSTKSZ));
 
   // Only set an alternative stack if there isn't already one, or if the current
   // one is too small.