Sets a default radix

[catenacyber]

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10437

Before it gets used in AsmLexer::LexDigit

[aquynh]

i think the default radix is 16, not 10?

[aquynh]

merged, thanks!

[Summus-31c04089c3cd80]

hello,
I think the default radix should be 10, else, why set it to 16 again if KS_OPT_SYNTAX_RADIX16 ?
Moreover, since this commit, I have this bad behaviour :

➜ kstool x32nasm "push 10"
push 10 = [ 6a 10 ]

When I set the default radix to 10 :

➜ kstool x32nasm "push 10"
push 10 = [ 6a 0a ]

You can also verify results with this python code :

import keystone
ks10 = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_32)
ks10.syntax = keystone.KS_OPT_SYNTAX_NASM
print(' '.join('{:02x}'.format(x) for x in ks10.asm('push 10')[0]))

ks16 = keystone.Ks(keystone.KS_ARCH_X86, keystone.KS_MODE_32)
ks16.syntax = keystone.KS_OPT_SYNTAX_NASM | keystone.KS_OPT_SYNTAX_RADIX16
print(' '.join('{:02x}'.format(x) for x in ks16.asm('push 10')[0]))