taskset: fix logic error in "if it doesn't start with 0x..."

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
tftpd: support full 512-byte requests

Some HP PA-RISC firmware always sends fixed 512-byte requests,
with trailing garbage.

function                                             old     new   delta
tftpd_main                                           578     572      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
tftpd: tweak HP PA-RISC firmware bug compatibility

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
find: support -perm /BITS. Closes 7340

function                                             old     new   delta
parse_params                                        1487    1497     +10
func_perm                                             57      61      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 14/0)               Total: 14 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>