src: fix compilation error on 32-bit linux
src: fix compilation error on 32-bit linux

- As SQLINTEGER is defined as long int, store the number of errors in a int32_t
  variable instead of a SQLINTEGER. This is probably safe as it's highly
  unlikely to have so many errors as to produce an overflow.

Papercloud/node-odbc,wankdanker/node-odbc,Papercloud/node-odbc,wankdanker/node-odbc,wankdanker/node-odbc,Papercloud/node-odbc,wankdanker/node-odbc,Papercloud/node-odbc