base-files: fix telnet login on musl

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43006 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/files/bin/login.sh b/package/base-files/files/bin/login.sh
index 04b3fe2..25627b6 100755 (executable)
--- a/package/base-files/files/bin/login.sh
+++ b/package/base-files/files/bin/login.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 # Copyright (C) 2006-2011 OpenWrt.org
 
-if ( ! grep -qs '^root:[!x]\?:' /etc/shadow || \
-     ! grep -qs '^root:[!x]\?:' /etc/passwd ) && \
+if ( ! grep -qsE '^root:[!x]?:' /etc/shadow || \
+     ! grep -qsE '^root:[!x]?:' /etc/passwd ) && \
    [ -z "$FAILSAFE" ]
 then
        echo "Login failed."