ndisasm: fix handing of byte codes 250-253, 324
ndisasm: fix handing of byte codes 250-253, 324

Fix handling of byte codes 250-253 (sign-extended 32-bit immediate,
extended to 64 bits) and 324 (instruction must have osize 64).

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

turingstudio/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,letolabs/nasm,techkey/nasm,turingstudio/nasm,letolabs/nasm,Distrotech/nasm,techkey/nasm,turingstudio/nasm,projedi/nasm,projedi/nasm,Distrotech/nasm,techkey/nasm,Distrotech/nasm,letolabs/nasm,turingstudio/nasm,projedi/nasm,techkey/nasm,techkey/nasm