target: Fix target_core_register_fabric() for built-in fabric modules
If we try to create a fabric directory in configfs for one of the default hard-coded fabric modules (iscsi and loopback), and that fabric is actually built into the kernel, then the operation will spuriously fail because request_module() (for the code that's already linked into the kernel) fails. Fix this by running the autoprobing code only if an initial target_core_get_fabric() fails. Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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