Fix bit shift bug in caps

[bleggett]

This looks like a bit shift error for setting caps - we were putting low-word caps in the high word in some cases.

Before, without fix:

CapInh:    000001fb00000000
CapPrm:    000001ffffffffff
CapEff:    000001ffffffffff
CapBnd:    000001ffffffffff
CapAmb:    0000000000000000

With fix:

CapInh:	00000000a80405fb
CapPrm:	000001ffffffffff
CapEff:	000001ffffffffff
CapBnd:	000001ffffffffff
CapAmb:	0000000000000000

00000000a80405fb is expected for

        "AUDIT_WRITE",
        "CHOWN",
        "DAC_OVERRIDE",
        "FSETID",
        "FOWNER",
        "SETGID",
        "SETUID",
        "SETPCAP",
        "SETFCAP",
        "SYS_CHROOT",
        "MKNOD",
        "NET_BIND_SERVICE",
        "KILL",