Fixed VisualStudio7.0 compile error related to an std::vector<>::iterator

no longer being a pointer, fixed by using a &(*itr).

src/osgPlugins/geo/osgGeoStructs.h

@@ -418,7 +418,7 @@ public:
 		itr!=fields.end();
 		++itr)
 		{
-			if (itr->getToken()==fieldid) return itr;
+			if (itr->getToken()==fieldid) return &(*itr);
 		}
 		return NULL;
 	}