lockfile: remove unable_to_lock_error

The former caller uses unable_to_lock_message now.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Reviewed-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

lockfile.c

@@ -162,16 +162,6 @@ void unable_to_lock_message(const char *path, int err, struct strbuf *buf)
 			    absolute_path(path), strerror(err));
 }
 
-int unable_to_lock_error(const char *path, int err)
-{
-	struct strbuf buf = STRBUF_INIT;
-
-	unable_to_lock_message(path, err, &buf);
-	error("%s", buf.buf);
-	strbuf_release(&buf);
-	return -1;
-}
-
 NORETURN void unable_to_lock_die(const char *path, int err)
 {
 	struct strbuf buf = STRBUF_INIT;

lockfile.h

@@ -71,7 +71,6 @@ struct lock_file {
 #define LOCK_DIE_ON_ERROR 1
 #define LOCK_NO_DEREF 2
 
-extern int unable_to_lock_error(const char *path, int err);
 extern void unable_to_lock_message(const char *path, int err,
 				   struct strbuf *buf);
 extern NORETURN void unable_to_lock_die(const char *path, int err);