thodg/libgit2

diff --git a/src/attrcache.c b/src/attrcache.c
index 0ade38c..cf0707e 100644
--- a/src/attrcache.c
+++ b/src/attrcache.c
@@ -121,20 +121,22 @@ static int attr_cache_remove(git_attr_cache *cache, git_attr_file *file)
 {
 	int error = 0;
 	git_attr_file_entry *entry;
+	git_attr_file *old = NULL;
 
 	if (!file)
 		return 0;
+
 	if ((error = attr_cache_lock(cache)) < 0)
 		return error;
 
 	if ((entry = attr_cache_lookup_entry(cache, file->entry->path)) != NULL)
-		file = git__compare_and_swap(&entry->file[file->source], file, NULL);
+		old = git__compare_and_swap(&entry->file[file->source], file, NULL);
 
 	attr_cache_unlock(cache);
 
-	if (file) {
-		GIT_REFCOUNT_OWN(file, NULL);
-		git_attr_file__free(file);
+	if (old) {
+		GIT_REFCOUNT_OWN(old, NULL);
+		git_attr_file__free(old);
 	}
 
 	return error;
diff --git a/src/integer.h b/src/integer.h
index b08094c..61712ce 100644
--- a/src/integer.h
+++ b/src/integer.h
@@ -55,16 +55,16 @@ GIT_INLINE(bool) git__add_uint64_overflow(uint64_t *out, uint64_t one, uint64_t 
 }
 
 /* Use clang/gcc compiler intrinsics whenever possible */
-#if (SIZE_MAX == UINT_MAX) && __has_builtin(__builtin_uadd_overflow)
-# define git__add_sizet_overflow(out, one, two) \
-	__builtin_uadd_overflow(one, two, out)
-# define git__multiply_sizet_overflow(out, one, two) \
-	__builtin_umul_overflow(one, two, out)
-#elif (SIZE_MAX == ULONG_MAX) && __has_builtin(__builtin_uaddl_overflow)
+#if (SIZE_MAX == ULONG_MAX) && __has_builtin(__builtin_uaddl_overflow)
 # define git__add_sizet_overflow(out, one, two) \
 	__builtin_uaddl_overflow(one, two, out)
 # define git__multiply_sizet_overflow(out, one, two) \
 	__builtin_umull_overflow(one, two, out)
+#elif (SIZE_MAX == UINT_MAX) && __has_builtin(__builtin_uadd_overflow)
+# define git__add_sizet_overflow(out, one, two) \
+	__builtin_uadd_overflow(one, two, out)
+# define git__multiply_sizet_overflow(out, one, two) \
+	__builtin_umul_overflow(one, two, out)
 #else
 
 /**
diff --git a/src/submodule.c b/src/submodule.c
index e1f59b8..fc3dcb4 100644
--- a/src/submodule.c
+++ b/src/submodule.c
@@ -188,8 +188,7 @@ static int load_submodule_names(git_strmap *out, git_config *cfg)
 		git_buf_put(&buf, fdot + 1, ldot - fdot - 1);
 		git_strmap_insert(out, entry->value, git_buf_detach(&buf), rval);
 		if (rval < 0) {
-			giterr_set(GITERR_NOMEMORY, "Error inserting submodule into hash table");
-			free_submodule_names(out);
+			giterr_set(GITERR_NOMEMORY, "error inserting submodule into hash table");
 			return -1;
 		}
 	}
@@ -513,12 +512,12 @@ int git_submodule__map(git_repository *repo, git_strmap *map)
 			goto cleanup;
 	}
 	/* add back submodule information from index */
-	if (idx) {
+	if (mods && idx) {
 		if ((error = submodules_from_index(map, idx, mods)) < 0)
 			goto cleanup;
 	}
 	/* add submodule information from HEAD */
-	if (head) {
+	if (mods && head) {
 		if ((error = submodules_from_head(map, head, mods)) < 0)
 			goto cleanup;
 	}
diff --git a/tests/checkout/tree.c b/tests/checkout/tree.c
index c9581fd..b3b860c 100644
--- a/tests/checkout/tree.c
+++ b/tests/checkout/tree.c
@@ -441,6 +441,7 @@ void test_checkout_tree__pathlist_checkout_ignores_non_matches(void)
 	cl_assert(git_path_exists("testrepo/link_to_new.txt"));
 	cl_assert(git_path_exists("testrepo/new.txt"));
 
+	git_object_free(g_object);
 	cl_git_pass(git_revparse_single(&g_object, g_repo, "8496071c1b46c854b31185ea97743be6a8774479"));
 
 	g_opts.checkout_strategy =
@@ -454,10 +455,6 @@ void test_checkout_tree__pathlist_checkout_ignores_non_matches(void)
 	cl_assert(!git_path_exists("testrepo/branch_file.txt"));
 	cl_assert(!git_path_exists("testrepo/link_to_new.txt"));
 	cl_assert(git_path_exists("testrepo/new.txt"));
-
-	git_object_free(g_object);
-	g_object = NULL;
-
 }
 
 void test_checkout_tree__can_disable_pattern_match(void)