[PATCH] Fix external commands with --diff-options

[Michael Ellerman]

Hi,

There's a bug in the external command code if you specify an option with a 
dash in it, such as diff-options.

Never did write those unit tests did I :}

cheers

-- 
Michael Ellerman
IBM OzLabs

email: michael:ellerman.id.au
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wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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