kbuild: small fixes

Fix "make xconfig" and remove a reference to drivers/sbus/audio,
which does not exist.

(Sam Ravnborg)

Makefile

@@ -622,7 +622,7 @@ ifeq ($(filter-out $(noconfig_targets),$(MAKECMDGOALS)),)
 	make_with_config
 
 xconfig:
-	@$(call descend,scripts,kconfig.tk)
+	@$(call descend,scripts,scripts/kconfig.tk)
 	wish -f scripts/kconfig.tk
 
 menuconfig:

drivers/sbus/Makefile

@@ -7,6 +7,5 @@ obj-y    := sbus.o dvma.o
 endif
 
 obj-$(CONFIG_SBUSCHAR) += char/
-obj-$(CONFIG_SPARCAUDIO) += audio/
 
 include $(TOPDIR)/Rules.make