[v3] Improve a bit time_get error checking

[Paolo Carlini]

Hi,

noticed while reviewing 45896 that we can do a bit better here, more
improvements in the C++0x context. Tested x86_64-linux, committed.

Paolo.

//////////////////
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: CL_time_get_ec1
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20101007/a2e74192/attachment.ksh>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: patch_time_get_ec1
URL: <http://gcc.gnu.org/pipermail/libstdc++/attachments/20101007/a2e74192/attachment-0001.ksh>