verbose.mk: fix ERROR message in verbose mode

Fixes: aee3594 ("verbose.mk: print ERROR messages in non-verbose")
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

include/verbose.mk

@@ -30,13 +30,14 @@ ifeq ($(IS_TTY),1)
 endif
 
 define ERROR_MESSAGE
-  printf "$(_R)%s$(_N)\n" "$(1)" >&8
+  printf "$(_R)%s$(_N)\n" "$(1)" $(ERROR_MESSAGE_REDIR)
 endef
 
 ifeq ($(findstring s,$(OPENWRT_VERBOSE)),)
   define MESSAGE
 	printf "$(_Y)%s$(_N)\n" "$(1)" >&8
   endef
+  ERROR_MESSAGE_REDIR:=>&8
 
   ifeq ($(QUIET),1)
     ifneq ($(CURDIR),$(TOPDIR))
@@ -60,4 +61,5 @@ else
   define MESSAGE
     printf "%s\n" "$(1)"
   endef
+  ERROR_MESSAGE_REDIR:=>&2
 endif