credential: correct order of parameters for credential_match

Since the beginning in 118250728e (credential: apply helper config,
2011-12-10), the declaration for that function used a different order
than the implementation.

All callers use the same order than the implementation, so update
the declaration in credential.h to match.

Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

credential.h

diff --git a/credential.h b/credential.h
index f51703d..c0e17e3 100644
--- a/credential.h
+++ b/credential.h
@@ -189,7 +189,7 @@ void credential_write(const struct credential *, FILE *);
 void credential_from_url(struct credential *, const char *url);
 int credential_from_url_gently(struct credential *, const char *url, int quiet);
 
-int credential_match(const struct credential *have,
-		     const struct credential *want);
+int credential_match(const struct credential *want,
+		     const struct credential *have);
 
 #endif /* CREDENTIAL_H */