packaging: fix rpm scriptlet error

packaging: fix rpm scriptlet error

One line bash condition in a rpm script could cause scriptlet error like
below,
"warning: %post(qemu-accel-XXXX) scriptlet failed, exit status 1"
because '[ ]' returns with 1 exit status when the expression parameter is false.

You can refer to following page,
https://en.wikipedia.org/wiki/Test_(Unix)#Exit_status

Currently the condition is useless so it could be removed.

Change-Id: I25ae94ec7ad1f98bd84a127ea8a6a5c7aab21e32
Signed-off-by: Chan Lee <chan45.lee@samsung.com>