kernel: Don't print grep error messages when checking version
Avoids:
$ lunch lineage_sdk_phone_x86
grep: build/make/target/board/emulator_x86/Makefile: No such file or directory (x4)
Change-Id: Ie803d5ca93e6e7ae94625e7ee3ab0bf337e0515d
diff --git a/config/BoardConfigKernel.mk b/config/BoardConfigKernel.mk
index e7d245d..fc60c1c 100644
--- a/config/BoardConfigKernel.mk
+++ b/config/BoardConfigKernel.mk
@@ -51,8 +51,8 @@
KERNEL_ARCH := $(TARGET_KERNEL_ARCH)
endif
-KERNEL_VERSION := $(shell grep "^VERSION = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
-KERNEL_PATCHLEVEL := $(shell grep "^PATCHLEVEL = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
+KERNEL_VERSION := $(shell grep -s "^VERSION = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
+KERNEL_PATCHLEVEL := $(shell grep -s "^PATCHLEVEL = " $(TARGET_KERNEL_SOURCE)/Makefile | awk '{ print $$3 }')
TARGET_KERNEL_VERSION ?= $(shell echo $(KERNEL_VERSION)"."$(KERNEL_PATCHLEVEL))
CLANG_PREBUILTS := $(BUILD_TOP)/prebuilts/clang/host/$(HOST_PREBUILT_TAG)/clang-r450784d