Don't exit after pulling init or kernel image
Don't exit after pulling init or kernel image

Due to a missing else the tool would previously terminate with an error
message showing that the kernel or init image didn't exist, even if it
was pulled successfully. Invoking the tool again would continue to the
next image.

Signed-off-by: Magnus Skjegstad <9f4ca770b638615ac5c3e0d2da16b77c80c2f2c6@skjegstad.com>

YuPengZTE/linuxkit,yankcrime/linuxkit,konstruktoid/linuxkit,furious-luke/linuxkit,justincormack/linuxkit,konstruktoid/linuxkit,linuxkit/linuxkit,linuxkit/linuxkit,furious-luke/linuxkit,deitch/linuxkit,davefreitag/tool,linuxkit/linuxkit,rn/linuxkit,YuPengZTE/linuxkit,yankcrime/linuxkit,JohnnyLeone/linuxkit,JohnnyLeone/linuxkit,justincormack/linuxkit,JohnnyLeone/linuxkit,justincormack/linuxkit,rn/linuxkit,yankcrime/linuxkit,furious-luke/linuxkit,konstruktoid/linuxkit,deitch/linuxkit,YuPengZTE/linuxkit,riyazdf/tool,djs55/linuxkit,konstruktoid/linuxkit,JohnnyLeone/linuxkit,justincormack/linuxkit,djs55/linuxkit,deitch/linuxkit,YuPengZTE/linuxkit,yankcrime/linuxkit,justincormack/linuxkit,YuPengZTE/linuxkit,justincormack/linuxkit,djs55/linuxkit,furious-luke/linuxkit,yankcrime/linuxkit,linuxkit/linuxkit,rn/linuxkit,furious-luke/linuxkit,djs55/linuxkit,deitch/linuxkit,konstruktoid/linuxkit,linuxkit/linuxkit,deitch/linuxkit,YuPengZTE/linuxkit,justincormack/tool,yankcrime/linuxkit,JohnnyLeone/linuxkit,konstruktoid/linuxkit,rn/linuxkit,djs55/linuxkit,rn/linuxkit