[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 - Felix Fietkau (nbd)

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Pushed a backport to my staging tree at https://git.openwrt.org/?p=openwrt/staging/nbd.git;a=summary
Please test.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1136#comment4447