osu: Fix to return non-zero if upgrade is failed

osu: Fix to return non-zero if upgrade is failed

In the previous code, osu returned 0 even if upgrade is failed, due to
the deinitialization code. Previously, if error occured during the
upgrade, aborted the rest works and called the deinitialization function
'update_control_deinitialize' and returned its return value.
This caused osu to return 0 even an error is occured, which is invalid
behavior.
To fix this issue, the return value of deinitialization function is
treated as a different variable.

Change-Id: Ie536bafc5bb4e31f461cf1df98db496d77a24664
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>