[pacman-dev] Fix -Sy and -Sp operations.

[Xavier]

When the -Sy operation failed, the lock wasn't removed because
alpm_trans_release wasn't called. This is fixed now.

Also, after my last change in commit 52e7e6d74733f7a431376a9e528c4fe4d3732068 ,
Sp didn't do anything anymore.
That's because needs_transaction returned false for -Sp, so the sync transaction
wasn't run. However, the current implementation of -Sp requires a sync transaction.

Also, since a transaction creates the lock file at the beginning, and releases it
at the end, this mean that -Sp requires root access anyway..

I think I understand now why Aaron found that the current -Sp implementation is hackish :)

Signed-off-by: Chantry Xavier <shiningxc at gmail.com>
---
 src/pacman/sync.c |    3 ++-
 src/pacman/util.c |    3 +--
 2 files changed, 3 insertions(+), 3 deletions(-)
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