[FS#822] busybox (ash) sporadically segfaults running shell scripts on ar71xx

[LEDE Bugs]

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FS#822 - busybox (ash) sporadically segfaults running shell scripts on ar71xx
User who did this: Matthias Schiffer (NeoRaider)
Summary: busybox (ash) segfaults running shell scripts on ar71xx -> busybox (ash) sporadically segfaults running shell scripts on ar71xx

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=822