usr_bin/grml-lock: Fix a couple of shellcheck warnings

- SC2086: Double quote to prevent globbing and word splitting.
- Ignore SC1091
- SC2230: which is non-standard. Use builtin 'command -v' instead
- SC2181: Check exit code directly with e.g. 'if mycmd;', not indirectly with $?

diff --git a/usr_bin/grml-lock b/usr_bin/grml-lock
index 27ba082..46e0ab5 100755 (executable)
--- a/usr_bin/grml-lock
+++ b/usr_bin/grml-lock
@@ -21,6 +21,7 @@ Usage: just execute $PN without any further options."
 fi
 
 if [ -r /etc/grml/script-functions ] ; then
+   # shellcheck disable=SC1091
    . /etc/grml/script-functions
    check4progs physlock sudo chpasswd dialog || { echo "Sorry, necessary tools missing - can not continue. Exiting.">&2 ; exit 1 ; }
 fi