fix exit status

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@35671 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.sun2/main.c

@@ -744,7 +744,7 @@ int main(int argc, char *argv[])
     G_debug(3, "OUTGR starts...");
     OUTGR();
 
-    return 1;
+    exit(EXIT_SUCCESS);
 }