Kernel panic in qed_grc_dump_addr_range()

Issue

• Kernel panics in qed_grc_dump_addr_range() can be hit from multiple paths, eg:

    [exception RIP: qed_grc_dump_addr_range+264]

 #8 [ffffa8e43493f830] qed_protection_override_dump at ffffffffc068b2ed [qed]
 #9 [ffffa8e43493f888] qed_dbg_protection_override_dump at ffffffffc068c792 [qed]
#10 [ffffa8e43493f8c8] qed_dbg_feature at ffffffffc068fa8f [qed]
#11 [ffffa8e43493f948] qed_dbg_all_data at ffffffffc0690211 [qed]
#12 [ffffa8e43493fa78] qed_fw_fatal_reporter_dump at ffffffffc069798a [qed]
#13 [ffffa8e43493faa8] devlink_health_do_dump at ffffffff8aa95e51
#14 [ffffa8e43493fad0] devlink_health_report at ffffffff8aa9ae19
#15 [ffffa8e43493fb08] qed_report_fatal_error at ffffffffc0697baf [qed]
#16 [ffffa8e43493fb28] qed_hw_err_notify at ffffffffc06d32d7 [qed]
#17 [ffffa8e43493fcb0] qed_spq_post at ffffffffc06b1011 [qed]
#18 [ffffa8e43493fd20] qed_fcoe_destroy_conn at ffffffffc06b2e91 [qed]
#19 [ffffa8e43493fd68] qedf_cleanup_fcport at ffffffffc05e7597 [qedf]
#20 [ffffa8e43493fda0] qedf_rport_event_handler at ffffffffc05e7bf7 [qedf]
#21 [ffffa8e43493fe20] fc_rport_work at ffffffffc02da715 [libfc]
#22 [ffffa8e43493fe90] process_one_work at ffffffff8a319663
#23 [ffffa8e43493fed8] worker_thread at ffffffff8a319850
#24 [ffffa8e43493ff10] kthread at ffffffff8a320ea4

    [exception RIP: qed_grc_dump_addr_range+0x108]

 #8 [ffffa8acc64abb68] qed_protection_override_dump at ffffffffc02662ed [qed]
 #9 [ffffa8acc64abbc0] qed_dbg_protection_override_dump at ffffffffc0267792 [qed]
#10 [ffffa8acc64abc00] qed_dbg_feature at ffffffffc026aa8f [qed]
#11 [ffffa8acc64abc80] qed_dbg_all_data at ffffffffc026b211 [qed]
#12 [ffffa8acc64abdb0] qed_fw_fatal_reporter_dump at ffffffffc027298a [qed]
#13 [ffffa8acc64abde0] devlink_health_do_dump at ffffffff82497f61
#14 [ffffa8acc64abe08] devlink_health_report at ffffffff8249cf29
#15 [ffffa8acc64abe40] qed_report_fatal_error at ffffffffc0272baf [qed]
#16 [ffffa8acc64abe60] qede_sp_task at ffffffffc045ed32 [qede]
#17 [ffffa8acc64abe90] process_one_work at ffffffff81d19783
#18 [ffffa8acc64abed8] worker_thread at ffffffff81d19970
#19 [ffffa8acc64abf10] kthread at ffffffff81d20fc4
#20 [ffffa8acc64abf50] ret_from_fork at ffffffff828002cf