be2iscsi: Fix kernel panic when device initialization fails

commit 2e7cee027b26cbe7e6685a7a14bd2850bfe55d33 upstream.

Kernel panic was happening as iscsi_host_remove() was called on
a host which was not yet added.

Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>