Don't crash when calling jumpToFrame() on an empty QMovie

Properly return an invalid frame when calling jumpToFrame()
with a non existent frame number.

Fixes: QTBUG-79029
Change-Id: Ic40f4a6de3106fab42c0bb6c961194be47b04e31
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/image/qmovie.cpp b/src/gui/image/qmovie.cpp
index 79203c7b98..f03c8836df 100644
--- a/src/gui/image/qmovie.cpp
+++ b/src/gui/image/qmovie.cpp
@@ -416,7 +416,7 @@ QFrameInfo QMoviePrivate::infoForFrame(int frameNumber)
             } else {
                 // We've read all frames now. Return an end marker
                 haveReadAll = true;
-                return QFrameInfo::endMarker();
+                return frameNumber == greatestFrameNumber + 1 ? QFrameInfo::endMarker() : QFrameInfo();
             }
         }
     }