Sos.ml: no more warnings
Sos.ml: no more warnings

 apart for a few non-exhaustive patterns, there was also some unused
 let-in variables. Hard to check whether the apparently useless code
 is doing some side-effect or not... It seems not, so I've removed
 completely the corresponding code. Frederic, is that ok ?

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@12570 85f007b7-540e-0410-9357-904b9bb8a0f7

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