kbuild: setlocalversion: print error to STDERR

I tried to use 'make O=...' from an unclean source tree. This triggered
the error path of setlocalversion. But by printing to STDOUT, it created
a broken localversion which then caused another (unrelated) error:

"4.7.0-rc2Error: kernelrelease not valid - run make prepare to update it" exceeds 64 characters

After printing to STDERR, the true build error gets displayed later:

  /home/wsa/Kernel/linux is not clean, please run 'make mrproper'
  in the '/home/wsa/Kernel/linux' directory.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Michal Marek <mmarek@suse.com>

diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 63d91e2..966dd39 100755 (executable)
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -143,7 +143,7 @@ fi
 if test -e include/config/auto.conf; then
        . include/config/auto.conf
 else
-       echo "Error: kernelrelease not valid - run 'make prepare' to update it"
+       echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
        exit 1
 fi