Remove extra ';' after QPrint namespace block

The extra ';' causes a warning when gcc is used with -Wpedantic.

Change-Id: I3d99aca6f160e46dbe2173106160474664e06b2c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

src/printsupport/kernel/qprint_p.h

@@ -143,7 +143,7 @@ namespace QPrint {
         QPrint::OutputBinId id;
     };
 
-};
+}
 
 struct InputSlotMap {
     QPrint::InputSlotId id;