[hackers] [slock] Use NUL character constant explicitly || FRIGN

[git]

commit b099d2fd1868a5497069b85e5af0e6148077a6ba
Author:     FRIGN <d...@frign.de>
AuthorDate: Sat Oct 1 23:56:33 2016 +0200
Commit:     Markus Teich <markus.te...@stusta.mhn.de>
CommitDate: Mon Oct 10 20:40:13 2016 +0200

    Use NUL character constant explicitly

diff --git a/slock.c b/slock.c
index 2a3027e..47d2e21 100644
--- a/slock.c
+++ b/slock.c
@@ -158,7 +158,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock 
**locks, int nscreens,
                                continue;
                        switch (ksym) {
                        case XK_Return:
-                               passwd[len] = 0;
+                               passwd[len] = '\0';
                                errno = 0;
                                if (!(inputhash = crypt(passwd, hash)))
                                        fprintf(stderr, "slock: crypt: %s\n", 
strerror(errno));
@@ -177,7 +177,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock 
**locks, int nscreens,
                                break;
                        case XK_BackSpace:
                                if (len)
-                                       passwd[len--] = 0;
+                                       passwd[len--] = '\0';
                                break;
                        default:
                                if (num && !iscntrl((int)buf[0]) &&