Fixes following complaints and suggestions:
In scripts/check-toolchain-clean.sh line 2:
eval `grep CONFIG_GCC_VERSION .config`
^-- SC2046 (warning): Quote this to prevent word splitting.
^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This can be used to ensure that the compiled code is up to date, when
something important changes in the toolchain.
A recent example of this is the gcc 11 fix for a code miscompilation issue
Signed-off-by: Felix Fietkau <nbd@nbd.name>