Merged revision 55500 from trunk:

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  r55500 | chris_kohlhoff | 2009-08-10 21:38:00 +1000 (Mon, 10 Aug 2009) | 2 lines
  
  Add missing returns for failure cases in write_some_at and read_some_at.
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[SVN r55671]

libs/asio

@@ -1 +1 @@
-Subproject commit 915a14891075b4e70c7a2e5fa06bc976b0b7af81
+Subproject commit 63004b550145a1ba5e6658bcca39160617174023