QtSql: fix code snippets

The code snippets retrieving the native database driver handles was
using qstrcmp() wrong since that is returning 0 when the strings are
equal. In some snippets there was even a plain char * comparison which
would not work at all.
Fix all the places by correctly using qstrcmp() and replace the checks
for the valid pointer by not checking for 0.

Fixes: QTBUG-70598
Change-Id: I5c53dcfc51c958203fc60fa6a23dd6b27faa1d96
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

0 files changed, 0 insertions, 0 deletions