When dfu_fill_entity fail, need to free dfu to avoid memory leak.
Reported by Coverity:
"
Resource leak (RESOURCE_LEAK)
leaked_storage: Variable dfu going out of scope leaks the storage
it points to.
"
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: "Łukasz Majewski" <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>
(cherry picked from commit 5d8fae79163e94671956c99654abf48cf49757ba)
9c2069ad87