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, 1 insertions, 1 deletions

diff --git a/src/tree.c b/src/tree.c
index 466180451..9134451c6 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -688,7 +688,7 @@ int git_treebuilder_new(
 
 	bld->repo = repo;
 
-	if (git_strmap_alloc(&bld->map) < 0) {
+	if (git_strmap_new(&bld->map) < 0) {
 		git__free(bld);
 		return -1;
 	}