clar: Fix warnings

src/revparse.c

@@ -537,7 +537,7 @@ static int oid_for_tree_path(git_oid *out, git_tree *tree, git_repository *repo,
    char *tok;
    void *alloc = str;
    git_tree *tree2 = tree;
-   const git_tree_entry *entry;
+   const git_tree_entry *entry = NULL;
 
    while ((tok = git__strtok(&str, "/\\")) != NULL) {
       entry = git_tree_entry_byname(tree2, tok);

tests-clar/object/tree/write.c

@@ -89,7 +89,8 @@ void test_object_tree_write__subtree(void)
 void test_object_tree_write__sorted_subtrees(void)
 {
 	git_treebuilder *builder;
-	unsigned int i, position_c, position_cake, position_config;
+	unsigned int i;
+	int position_c = -1, position_cake = -1, position_config = -1;
 
 	struct {
 		unsigned int attr;
@@ -140,6 +141,10 @@ void test_object_tree_write__sorted_subtrees(void)
 			position_config = i;
 	}
 
+	cl_assert(position_c != -1);
+	cl_assert(position_cake != -1);
+	cl_assert(position_config != -1);
+
 	cl_assert(position_c < position_cake);
 	cl_assert(position_cake < position_config);
 

tests-clar/revwalk/mergebase.c

 #include "clar_libgit2.h"
 #include "vector.h"
+#include <stdarg.h>
 
 static git_repository *_repo;