Fix pythonic bug

[trufae]

This commit fixes these two warnings:

cs.c: In function ‘cs_option’:
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cs.c:710:4: error: this ‘if’ clause does not guard... [-Werror=misleading-indentation]
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  710 |    if (value)
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      |    ^~
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cs.c:712:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
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  712 |     if (handle->skipdata_setup.mnemonic == NULL)
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      |     ^~

[aquynh]

merged, thanks!