techpack: camera-bengal: Add missing braces in cam_ope_mgr_create_kmd_buf()

Cross-checked with msm-5.15 tag. The change does not exist as a separate
commit and is squashed into the initial import.

Change-Id: Ie922c512d7ea24661d3179cfd156ab8eb6fcc363
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>