fix segfault in pair style hybrid/scaled due to unallocated data

src/pair_hybrid_scaled.cpp

@@ -276,6 +276,8 @@ void PairHybridScaled::settings(int narg, char **arg)
   // allocate list of sub-styles as big as possibly needed if no extra args
 
   styles = new Pair *[narg];
+  cutmax_style = new double[narg];
+  memset(cutmax_style, 0.0, narg*sizeof(double));
   keywords = new char *[narg];
   multiple = new int[narg];