Fix one bug raised by coverity

testing/testing_zauxiliary.c

@@ -175,9 +175,9 @@ int main (int argc, char **argv)
         exit(1);
     }
 
-    sscanf( argv[1], "%d", &ncores );
-    sscanf( argv[2], "%d", &ngpus  );
-    sscanf( argv[3], "%s", func    );
+    sscanf( argv[1], "%d",   &ncores );
+    sscanf( argv[2], "%d",   &ngpus  );
+    sscanf( argv[3], "%31s",  func   );
 
     /* Initialize MORSE */
     /*if(nthreads_per_worker)