Update sqlsrv/ez_sql_sqlsrv.php

Fixed a typo on line 319.
Defined $col as a new object to confirm to strict, as well as added a
few 'isset()'s to keep PHP from complaining. Though, I'm unsure if the
change on line 321 will affect the intended use.
Merge pull request #17 from ioscream/patch-1

Update sqlsrv/ez_sql_sqlsrv.php