e2image: require that -a option is used only with raw or QCOW2 image

All data cannot be included in normal image file so e2image should exit
in this case.

Signed-off-by: Tomas Racek <tracek@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
1 file changed