Merge branch 'tb/shallow-cleanup'

Code cleanup.

* tb/shallow-cleanup:
  shallow: use struct 'shallow_lock' for additional safety
  shallow.h: document '{commit,rollback}_shallow_file'
  shallow: extract a header file for shallow-related functions
  commit: make 'commit_graft_pos' non-static

send-pack.c

@@ -15,6 +15,7 @@
 #include "oid-array.h"
 #include "gpg-interface.h"
 #include "cache.h"
+#include "shallow.h"
 
 int option_parse_push_signed(const struct option *opt,
 			     const char *arg, int unset)