fix pointer style to match the style guide

We do this in a lot of places, but we're inconsistent.
Normalize the code to the Google C++ style guide.

Change-Id: Ic2aceab661ce8f6b993dda21b1cdf5d2198dcbbf
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2262932
Reviewed-by: Sterling Augustine <saugustine@google.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>

src/common/android/testing/pthread_fixes.h

@@ -80,7 +80,7 @@ int pthread_barrier_wait(pthread_barrier_t* barrier) {
   return 0;
 }
 
-int pthread_barrier_destroy(pthread_barrier_t *barrier) {
+int pthread_barrier_destroy(pthread_barrier_t* barrier) {
   barrier->count = 0;
   pthread_cond_destroy(&barrier->cond);
   pthread_mutex_destroy(&barrier->mutex);