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>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sql/doc/snippets/code/doc_src_sql-driver.cpp b/src/sql/doc/snippets/code/doc_src_sql-driver.cpp
index 2c0e824db3..54576733bf 100644
--- a/src/sql/doc/snippets/code/doc_src_sql-driver.cpp
+++ b/src/sql/doc/snippets/code/doc_src_sql-driver.cpp
@@ -106,7 +106,7 @@ while (query.next()) {
     QVariant v = query.result()->handle();
     if (qstrcmp(v.typeName(), "PGresult*") == 0) {
         PGresult *handle = *static_cast<PGresult **>(v.data());
-        if (handle != 0) {
+        if (handle) {
             // Do something...
         }
     }