lib.sh x_(): Remove warning of empty args

It's completely unnecessary, and I forsee this
check breaking the build system at some point,
since some commands rely on the output of other
commands. Therefore, I've removed this check.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/lib.sh

@@ -176,7 +176,6 @@ find_ex()
 
 x_()
 {
-	[ $# -lt 1 ] && printf "WARNING: x_ called without arguments\n" 1>&2
 	[ $# -lt 1 ] || [ -n "$1" ] || err "Empty first arg: x_ $(echo "$@")"
 	[ $# -lt 1 ] || "$@" || err "Unhandled error for: $(echo "$@")"; :
 }