maps: use uniform lifecycle management functions

Currently, the lifecycle functions for maps (allocation, deallocation, resize)
are not named in a uniform way and do not have a uniform function signature.
Rename the functions to fix that, and stick to libgit2's naming scheme of saying
`git_foo_new`. This results in the following new interface for allocation:

- `int git_<t>map_new(git_<t>map **out)` to allocate a new map, returning an
  error code if we ran out of memory

- `void git_<t>map_free(git_<t>map *map)` to free a map

- `void git_<t>map_clear(git<t>map *map)` to remove all entries from a map

This commit also fixes all existing callers.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/pack.c b/src/pack.c
index cdd7e9e60..88af6afd4 100644
--- a/src/pack.c
+++ b/src/pack.c
@@ -92,8 +92,8 @@ static void cache_free(git_pack_cache *cache)
 
 static int cache_init(git_pack_cache *cache)
 {
-	cache->entries = git_offmap_alloc();
-	GIT_ERROR_CHECK_ALLOC(cache->entries);
+	if (git_offmap_new(&cache->entries) < 0)
+		return -1;
 
 	cache->memory_limit = GIT_PACK_CACHE_MEMORY_LIMIT;