This backports a commit which fixes a use after free bug in awk.
CVE-2022-30065 description:
A use-after-free in Busybox 1.35-x's awk applet leads to denial of
service and possibly code execution when processing a crafted awk
pattern in the copyvar function.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
