kbuild: fix build with O=..

.kernelrelease was saved in same directory as kernel source also
with make O=...
Make sure we kick in the normal logic to shift to the output directory
when we build .kernelrelease after executing *config.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 252a659896f3..31bbc6ab3b8a 100644
--- a/Makefile
+++ b/Makefile
@@ -442,7 +442,7 @@ export KBUILD_DEFCONFIG
 config %config: scripts_basic outputmakefile FORCE
         $(Q)mkdir -p include/linux
         $(Q)$(MAKE) $(build)=scripts/kconfig $@
-        $(Q)$(MAKE) .kernelrelease
+        $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 
 else
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