zero-initialize Wm struct

src/main.c

@@ -21,7 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 int main(int argc, char **arg)
 {
-    Wm wm;
+    Wm wm = {0};
 
     wm_init(&wm);
     return 0;