qla2xxx: Comment out unreachable code

Comment out the code that is never reached in qla83xx_idc_unlock()
and also in qlt_set_data_offset() to avoid that static source code
analysis tools report warnings for this code.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>