v.vect.stats: fix compiler warning

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61344 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.vect.stats/main.c

@@ -217,7 +217,9 @@ int main(int argc, char *argv[])
 
     if (print_flag->answer)
 	/* get field separator */
-	fs = G_option_to_separator(fs_opt);
+	    fs = G_option_to_separator(fs_opt);
+    else
+	    fs = NULL;
 
     /* check for stats */
     if (method_opt->answer) {