kbuild: Remove wildcard on KBUILD_OUTPUT

This patch removes unnecessary wildcard on KBUILD_OUTPUT
Signed-off-by: Coywolf Qi Hunt <coywolf@greatcn.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Makefile

@@ -102,7 +102,7 @@ ifneq ($(KBUILD_OUTPUT),)
 # check that the output directory actually exists
 saved-output := $(KBUILD_OUTPUT)
 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
-$(if $(wildcard $(KBUILD_OUTPUT)),, \
+$(if $(KBUILD_OUTPUT),, \
      $(error output directory "$(saved-output)" does not exist))
 
 .PHONY: $(MAKECMDGOALS)