[PATCH] Fix crash during connect using SSPI auth

Hi,

I ran into a crash in psqlodbc driver on Windows while trying to connect
using SSPI authentication (both client and server are on same Windows
host, using a Windows local account instead of domain account, without
any Kerberos setup).

The crash is due to a NULL pointer dereference in function
extract_extra_attribute_setting(), ci->conn_settings.name was
NULL in caller MakePrincHint():

1741 char *extract_extra_attribute_setting(const pgNAME setting, ...
1742 {
1743 const char *str = GET_NAME(setting);
...
1750 for (cptr = str; *cptr; cptr++) <-- *cptr crashes

Please see attached stack trace for more details.

With attached patch, connection using SSPI authentication was
successful.

Thanks,
Nikhil