[BlueZ] obexd: Fix memory leak

[Bastien Nocera <hadess@hadess.net>]

To not leak "buf", we need object->buffer to take ownership of it using
g_string_new_take() (but it's only available in 2.78 and newer), or we
need to actually free "buf".

Error: RESOURCE_LEAK (CWE-772): [#def66] [important]
bluez-5.75/obexd/plugins/filesystem.c:411:3: alloc_arg: "g_file_get_contents" allocates memory that is stored into "buf".
bluez-5.75/obexd/plugins/filesystem.c:418:3: noescape: Resource "buf" is not freed or pointed-to in "g_string_new".
bluez-5.75/obexd/plugins/filesystem.c:440:2: leaked_storage: Variable "buf" going out of scope leaks the storage it points to.
438|			*err = 0;
439|
440|->	return object;
441|
442|   fail:
---
 obexd/plugins/filesystem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/obexd/plugins/filesystem.c b/obexd/plugins/filesystem.c
index f52927541bab..4887a0b8ac81 100644
--- a/obexd/plugins/filesystem.c
+++ b/obexd/plugins/filesystem.c
@@ -416,6 +416,7 @@ static void *capability_open(const char *name, int oflag, mode_t mode,
 		}
 
 		object->buffer = g_string_new(buf);
+		g_free(buf);
 
 		if (size)
 			*size = object->buffer->len;
-- 
2.44.0