filebuf: add git_filebuf_flush()

src/filebuf.c

@@ -130,6 +130,11 @@ GIT_INLINE(int) flush_buffer(git_filebuf *file)
 	return result;
 }
 
+int git_filebuf_flush(git_filebuf *file)
+{
+	return flush_buffer(file);
+}
+
 static int write_normal(git_filebuf *file, void *source, size_t len)
 {
 	if (len > 0) {

src/filebuf.h

@@ -81,5 +81,6 @@ int git_filebuf_commit(git_filebuf *lock, mode_t mode);
 int git_filebuf_commit_at(git_filebuf *lock, const char *path, mode_t mode);
 void git_filebuf_cleanup(git_filebuf *lock);
 int git_filebuf_hash(git_oid *oid, git_filebuf *file);
+int git_filebuf_flush(git_filebuf *file);
 
 #endif