common.h: remove cxfree

Apparently XFree does take NULL.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/c2.c

@@ -1455,7 +1455,7 @@ static inline void c2_match_once_leaf(session_t *ps, const struct managed_win *w
 		// Free the string after usage, if necessary
 		if (tgt_free) {
 			if (C2_L_TATOM == pleaf->type)
-				cxfree(tgt_free);
+				XFree(tgt_free);
 			else
 				free(tgt_free);
 		}

src/common.h

@@ -538,16 +538,6 @@ static inline struct timespec get_time_timespec(void) {
 	return tm;
 }
 
-/**
- * Wrapper of XFree() for convenience.
- *
- * Because a NULL pointer cannot be passed to XFree(), its man page says.
- */
-static inline void cxfree(void *data) {
-	if (data)
-		XFree(data);
-}
-
 /**
  * Return the painting target window.
  */

src/compton.c

@@ -913,7 +913,7 @@ static bool register_cm(session_t *ps) {
 		}
 		Xutf8SetWMProperties(ps->dpy, ps->reg_win, "compton", "compton", NULL, 0,
 		                     NULL, NULL, h);
-		cxfree(h);
+		XFree(h);
 	}
 
 	// Set _NET_WM_PID

src/compton.h

@@ -113,7 +113,7 @@ static inline XTextProperty *make_text_prop(session_t *ps, char *str) {
 	XTextProperty *pprop = ccalloc(1, XTextProperty);
 
 	if (XmbTextListToTextProperty(ps->dpy, &str, 1, XStringStyle, pprop)) {
-		cxfree(pprop->value);
+		XFree(pprop->value);
 		free(pprop);
 		pprop = NULL;
 	}
@@ -133,8 +133,8 @@ wid_set_text_prop(session_t *ps, xcb_window_t wid, xcb_atom_t prop_atom, char *s
 	}
 
 	XSetTextProperty(ps->dpy, wid, pprop, prop_atom);
-	cxfree(pprop->value);
-	cxfree(pprop);
+	XFree(pprop->value);
+	XFree(pprop);
 
 	return true;
 }

src/opengl.c

@@ -197,7 +197,7 @@ bool glx_init(session_t *ps, bool need_render) {
 	success = true;
 
 glx_init_end:
-	cxfree(pvis);
+	XFree(pvis);
 
 	if (!success)
 		glx_destroy(ps);

src/win.c

@@ -310,10 +310,10 @@ int win_get_name(session_t *ps, struct managed_win *w) {
 		    !nstr || !strlst) {
 			if (strlst)
 				XFreeStringList(strlst);
-			cxfree(text_prop.value);
+			XFree(text_prop.value);
 			return -1;
 		}
-		cxfree(text_prop.value);
+		XFree(text_prop.value);
 	}
 
 	int ret = 0;

src/x.c

@@ -100,11 +100,11 @@ bool wid_get_text_prop(session_t *ps, xcb_window_t wid, xcb_atom_t prop, char **
 		*pnstr = 0;
 		if (*pstrlst)
 			XFreeStringList(*pstrlst);
-		cxfree(text_prop.value);
+		XFree(text_prop.value);
 		return false;
 	}
 
-	cxfree(text_prop.value);
+	XFree(text_prop.value);
 	return true;
 }