linux-kernel - Makefile: fix usage of kernelrelease with M=foo

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Date:   Tue, 14 Mar 2023 15:02:47 +0200
From:   nvidia@...ens.org.il
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: Makefile: fix usage of kernelrelease with M=foo

Commit 1cb86b6c3136 ("kbuild: save overridden KERNELRELEASE in
include/config/kernel.release") set the command that is used for
printing the output of kernelrelease only when KBUILD_EXTMOD is not set.

Test:

make M=$PWD -s kernelversion
make M=$PWD -s kernelrelease

Should print both. Prints only kernelversion and an empty line for
kernelrelease. Included a simple patch that fixes this test.