blkid: add \n to the "-o udev" output when probe more devices

blkid: add \n to the "-o udev" output when probe more devices

Old output:
	# blkid -p -o udev /dev/sda{1,3}
	ID_FS_LABEL=/boot
	ID_FS_LABEL_ENC=\x2fboot
	ID_FS_UUID=f1cd38fa-c887-4ab8-834b-c8ee659b97fe
	ID_FS_UUID_ENC=f1cd38fa-c887-4ab8-834b-c8ee659b97fe
	ID_FS_VERSION=1.0
	ID_FS_TYPE=ext3
	ID_FS_USAGE=filesystem
	ID_FS_LABEL=BAR
	ID_FS_LABEL_ENC=BAR
	ID_FS_UUID=1f2aa318-9c34-462e-8d29-260819ffd657
	ID_FS_UUID_ENC=1f2aa318-9c34-462e-8d29-260819ffd657
	ID_FS_VERSION=2
	ID_FS_TYPE=swap
	ID_FS_USAGE=other

new output:
	# blkid -p -o udev /dev/sda{1,3}
	ID_FS_LABEL=/boot
	ID_FS_LABEL_ENC=\x2fboot
	ID_FS_UUID=f1cd38fa-c887-4ab8-834b-c8ee659b97fe
	ID_FS_UUID_ENC=f1cd38fa-c887-4ab8-834b-c8ee659b97fe
	ID_FS_VERSION=1.0
	ID_FS_TYPE=ext3
	ID_FS_USAGE=filesystem

	ID_FS_LABEL=BAR
	ID_FS_LABEL_ENC=BAR
	ID_FS_UUID=1f2aa318-9c34-462e-8d29-260819ffd657
	ID_FS_UUID_ENC=1f2aa318-9c34-462e-8d29-260819ffd657
	ID_FS_VERSION=2
	ID_FS_TYPE=swap
	ID_FS_USAGE=other

Reported-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>