Fix x_integer handling in Firebird backend.

Use "int", not "long long", for "into" parameters of x_integer type. This is
consistent with both "use" parameters and the other backends and just makes
more sense.

Do use "long long" for x_long_long "into" parameters.

Signed-off-by: Vadim Zeitlin <vz-soci@zeitlins.org>

src/backends/firebird/standard-into-type.cpp

@@ -85,6 +85,12 @@ void firebird_standard_into_type_backend::exchangeData()
             }
             break;
         case x_integer:
+            {
+                int t = from_isc<int>(var);
+                *reinterpret_cast<int *>(data_) = t;
+            }
+            break;
+        case x_long_long:
             {
                 long long t = from_isc<long long>(var);
                 *reinterpret_cast<long long *>(data_) = t;