Lens IOP: Fix stack-buffer-overflow in lens_set()

READ of size 8 at 0x7fff4fa3b180 thread T0
    #0 0x7ff30bf19d87 in lens_set /home/lebedevri/darktable/src/iop/lens.c:1649

Also fixes Coverity CID1034336
Remove unused uncompressed modes
Merge branch 'd750_rawfmts'
Merge remote-tracking branch 'original/master'