msm: camera: ife: Correct sanitary check logic

Current sanitary checks for integer overflow exhibit incorrect
behavior if number of RDI/paths paths are filled in as zero.
This change addresses that.

CRs-Fixed: 2513939
Change-Id: Ib4cf369971f2d50be0ec167ff78f46fb0d985b33
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>