[hackers] [dwm] gettextprop: check result of XGetTextProperty (undefined behaviour for XFree) || Hiltjo Posthuma

[git]

commit 99f78fa553f9ddb23fab73e47a408d66ca7f974c
Author:     Hiltjo Posthuma <hil...@codemadness.org>
AuthorDate: Fri Nov 3 16:36:32 2017 +0100
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Fri Nov 3 21:14:58 2017 +0100

    gettextprop: check result of XGetTextProperty (undefined behaviour for 
XFree)

diff --git a/dwm.c b/dwm.c
index b0d99c0..650d19f 100644
--- a/dwm.c
+++ b/dwm.c
@@ -910,8 +910,7 @@ gettextprop(Window w, Atom atom, char *text, unsigned int 
size)
        if (!text || size == 0)
                return 0;
        text[0] = '\0';
-       XGetTextProperty(dpy, w, &name, atom);
-       if (!name.nitems)
+       if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
                return 0;
        if (name.encoding == XA_STRING)
                strncpy(text, (char *)name.value, size - 1);