Fix vasprintf() call usage.

[mgaio]

Conforming to ASPRINTF(3), use vasprintf return value to test its success.
In case of failure the contents of buffer pointer is undefined.

Signed-off-by: Miguel Gaio miguel.gaio@intel.com

•  General Comment
• <img border=0 src='https://avatars.githubusercontent.com/u/6862950?v=3' height=16 width=16'> @miguelgalo Is this not equivalent to vasprintf fails by returning -1 #27 ? If so it is a know issue that we decided not to fix due to a complete log rework that was about to be merged (that was in december 14).
• <img border=0 src='https://avatars.githubusercontent.com/u/12096004?v=3' height=16 width=16'> This point must be handled as the build is broken using GNU compiler 4.8 (delivered 03 2013) and more.
• <img border=0 src='https://avatars.githubusercontent.com/u/6862950?v=3' height=16 width=16'> Solved by log rework in Port log rework from next #168 will be merged in windows_port then master shortly.

  

[krocard]

@miguelgalo Is this not equivalent to #27 ? If so it is a know issue that we decided not to fix due to a complete log rework that was about to be merged (that was in december 14). Since then the log rework merge has been continuously delayed :(

[mgaio]

This point must be handled as the build is broken using GNU compiler 4.8 (delivered 03 2013) and more.

[krocard]

Solved by log rework in #168 will be merged in windows_port then master shortly.