[SCSI] libfc: don't do discovery before callback is set
It's possible to "restart" discovery before it was started if an RSCN is received early enough. We were jumping to 0 due to the disc_callback function pointer not getting set. Don't restart discovery if disc_callback is NULL. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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