Only check errno if getpwuid() fails

Checking errno otherwise is unspecified.

diff --git a/slock.c b/slock.c
index aedee2e..399386b 100644 (file)
--- a/slock.c
+++ b/slock.c
@@ -67,10 +67,12 @@ getpw(void) { /* only run as root */
 
        errno = 0;
        pw = getpwuid(getuid());
-       if (errno)
-               die("slock: getpwuid: %s\n", strerror(errno));
-       else if (!pw)
-               die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
+       if (!pw) {
+               if (errno)
+                       die("slock: getpwuid: %s\n", strerror(errno));
+               else
+                       die("slock: cannot retrieve password entry (make sure to suid or sgid slock)\n");
+       }
        endpwent();
        rval =  pw->pw_passwd;