[PATCH] Makefile: enable -Wsparse-error for DEVELOPER build

[Junio C Hamano <gitster@xxxxxxxxx>]

With -Wsparse-error, "make sparse" would fail, instead of just
giving a warning message.

Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 config.mak.dev | 1 +
 1 file changed, 1 insertion(+)

diff --git c/config.mak.dev w/config.mak.dev
index 3126a5364d..022fb58218 100644
--- c/config.mak.dev
+++ w/config.mak.dev
@@ -1,5 +1,6 @@
 ifeq ($(filter no-error,$(DEVOPTS)),)
 DEVELOPER_CFLAGS += -Werror
+SPARSE_FLAGS += -Wsparse-error
 endif
 ifneq ($(filter pedantic,$(DEVOPTS)),)
 DEVELOPER_CFLAGS += -pedantic