Resolve cryptic awk-based code docuplication

defaults/initrd.scripts

@@ -298,6 +298,11 @@ run_shell() {
 	/bin/ash
 }
 
+fs_type_in_use() {
+	fs_type=$1
+	cut -d ' ' -f 3 < /proc/mounts | fgrep -q "${fs_type}"
+}
+
 mount_devfs () {
 	# Use devtmpfs if enabled in kernel,
 	# else tmpfs. Always run mdev just in case
@@ -307,13 +312,13 @@ mount_devfs () {
 	fi
 
 	# Options copied from /etc/init.d/udev-mount, should probably be kept in sync
-	if awk 'BEGIN{m=0;} /devtmpfs/{if($3 == "devtmpfs") {m=1;} } END { exit m;}' /proc/mounts; then
+	if ! fs_type_in_use devtmpfs; then
 		mount -t $devfs -o "exec,nosuid,mode=0755,size=10M" udev /dev \
 			|| bad_msg "Failed to mount /dev as ${devfs}"
 	fi
 
 	# http://git.busybox.net/busybox/plain/docs/mdev.txt
-	if awk 'BEGIN{m=0;} /devpts/{if($3 == "devpts") {m=1;} } END { exit m;}' /proc/mounts; then
+	if ! fs_type_in_use devpts; then
 		mkdir -m 0755 /dev/pts
 		mount -t devpts -o gid=5,mode=0620 devpts /dev/pts  || bad_msg "Failed to mount /dev/pts"
 	fi