*.h: add a few missing __attribute__((format))

Add missing format attributes to API functions that take printf
arguments.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -1385,6 +1385,7 @@ enum get_oid_result {
 };
 
 int repo_get_oid(struct repository *r, const char *str, struct object_id *oid);
+__attribute__((format (printf, 2, 3)))
 int get_oidf(struct object_id *oid, const char *fmt, ...);
 int repo_get_oid_commit(struct repository *r, const char *str, struct object_id *oid);
 int repo_get_oid_committish(struct repository *r, const char *str, struct object_id *oid);

quote.h

@@ -31,6 +31,7 @@ struct strbuf;
 
 void sq_quote_buf(struct strbuf *, const char *src);
 void sq_quote_argv(struct strbuf *, const char **argv);
+__attribute__((format (printf, 2, 3)))
 void sq_quotef(struct strbuf *, const char *fmt, ...);
 
 /*

strbuf.h

@@ -263,6 +263,7 @@ static inline void strbuf_insertstr(struct strbuf *sb, size_t pos,
 void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
 		     va_list ap);
 
+__attribute__((format (printf, 3, 4)))
 void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
 
 /**