apply-dot-config: fix wrong sh syntax (unexposed bug)
In sh, string comparison for equality is "=", not "==". Bash accepts
either operator but suggests to use "=" for posix conformance.
Our /bin/sh is currently busybox, which accepts "==" like bash, but
if you use ash or dash it fails:
$ CONFIG_FOO=y
$ if [ "$CONFIG_FOO" = "y" ]; then echo ok; fi
ok
$ if [ "$CONFIG_FOO" == "y" ]; then echo ok; fi
dash: 3: [: y: unexpected operator
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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