Use pre-increment operator with iterators

src/osx/fswatcher_fsevents.cpp

@@ -419,7 +419,7 @@ bool wxFsEventsFileSystemWatcher::RemoveAll()
         FSEventStreamStop(it->second);
         FSEventStreamInvalidate(it->second);
         FSEventStreamRelease(it->second);
-        it++;
+        ++it;
         ret |= true;
     }
     m_streams.clear();
@@ -499,7 +499,7 @@ int wxFsEventsFileSystemWatcher::GetWatchedPaths(wxArrayString* paths) const
     }
     wxFileSystemWatcherBase::GetWatchedPaths(paths);
     FSEventStreamRefMap::const_iterator it = m_streams.begin();
-    for ( ; it != m_streams.end(); it++ )
+    for ( ; it != m_streams.end(); ++it )
     {
         paths->push_back(it->first);
     }