[PATCH] usage: fix a sparse 'redeclared with different type' error

[Ramsay Jones <ramsay@ramsayjones.plus.com>]

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
---

Hi Jeff,

If you need to re-roll your 'jk/bug-to-abort' branch, could you please
squash this into the relevant patch (commit d8193743e0 "usage.c: add
BUG() function", 12-05-2017).

[Just FYI, sparse complains thus:
  usage.c:212:6: error: symbol 'BUG_fl' redeclared with different type
  (originally declared at git-compat-util.h:1076) - different modifiers
]

Thanks!

ATB,
Ramsay Jones

 usage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/usage.c b/usage.c
index 545136734..918b539bc 100644
--- a/usage.c
+++ b/usage.c
@@ -209,6 +209,7 @@ static NORETURN void BUG_vfl(const char *file, int line, const char *fmt, va_lis
 }
 
 #ifdef HAVE_VARIADIC_MACROS
+__attribute__((format (printf, 3, 4))) NORETURN
 void BUG_fl(const char *file, int line, const char *fmt, ...)
 {
 	va_list ap;
@@ -217,6 +218,7 @@ void BUG_fl(const char *file, int line, const char *fmt, ...)
 	va_end(ap);
 }
 #else
+__attribute__((format (printf, 1, 2))) NORETURN
 void BUG(const char *fmt, ...)
 {
 	va_list ap;
-- 
2.13.0