initramfs-framework: support dropping into shell on failure
When the init_fatal_sh boot parameter is present (i.e. used without
value) and a fatal problem occurs inside the initramfs-module, a shell
will be started instead of looping forever.
Useful for debugging.
Interestingly enough, the code was already indented to support such an
if check...
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
