Fixing memory leaks indicated by valgrind

This clears up the memory leaks that valgrind seems to find on
my machine.

src/path.c

@@ -624,5 +624,7 @@ int git_path_dirload_with_stat(
 		}
 	}
 
+	git_buf_free(&full);
+
 	return error;
 }

tests-clar/config/multivar.c

@@ -123,6 +123,8 @@ void test_config_multivar__replace(void)
 	n = 0;
 	cl_git_pass(git_config_get_multivar(cfg, _name, NULL, cb, &n));
 	cl_assert(n == 2);
+
+	git_config_free(cfg);
 }
 
 void test_config_multivar__replace_multiple(void)
@@ -145,4 +147,5 @@ void test_config_multivar__replace_multiple(void)
 	cl_git_pass(git_config_get_multivar(cfg, _name, "otherplace", cb, &n));
 	cl_assert(n == 2);
 
+	git_config_free(cfg);
 }

tests-clar/diff/workdir.c

@@ -158,6 +158,8 @@ void test_diff_workdir__to_tree(void)
 	cl_assert(exp.line_adds == 12);
 	cl_assert(exp.line_dels == 4);
 
+	git_diff_list_free(diff);
+
 	git_tree_free(a);
 	git_tree_free(b);
 }