r.sun: init PROJ transformation object

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@72606 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.sun/main.c

@@ -790,6 +790,7 @@ int main(int argc, char *argv[])
 	G_free_key_value(in_unit_info);
 
 	oproj.pj = NULL;
+	tproj.def = NULL;
 
 	if (GPJ_init_transform(&iproj, &oproj, &tproj) < 0)
 	    G_fatal_error(_("Unable to initialize coordinate transformation"));