[PATCH] kbuild/ppc: tell when uimage was not built

Tom Rini said:
  Note that there is still a trivial'ish change to make.  When mkimage
  doesn't exist on the host we should say "uImage not made" or
  something similar.

So I did like Tom asked.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc/boot/images/Makefile

@@ -20,8 +20,9 @@ quiet_cmd_uimage = UIMAGE  $@
 
 targets += uImage
 $(obj)/uImage: $(obj)/vmlinux.gz
+	$(Q)rm -f $@
 	$(call if_changed,uimage)
-	@echo '  Image $@ is ready'
+	@echo '  Image: $@' $(if $(wildcard $@),'is ready','not made')
 
 # Files generated that shall be removed upon make clean
 clean-files	:= sImage vmapus vmlinux* miboot* zImage* uImage