[FS#1136] HFSC kernel warnings with QoS / SQM

[LEDE Bugs]

The following task has a new comment added:

FS#1136 - HFSC kernel warnings with QoS / SQM
User who did this - Tony Ambardar (guidosarducci)

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Additional testing update: I've left the combination of **hfsc + fq_codel** running for the last week without a kernel WARNING. Happy days!
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1136#comment4493