lavc/qsv: suppress code scan complain

Suppress the complain "variables 'type' is used but maybe uninitialized".

libavcodec/qsv.c

@@ -31,6 +31,7 @@
 #include "libavutil/hwcontext.h"
 #include "libavutil/hwcontext_qsv.h"
 #include "libavutil/imgutils.h"
+#include "libavutil/avassert.h"
 
 #include "avcodec.h"
 #include "qsv_internal.h"
@@ -197,7 +198,7 @@ int ff_qsv_find_surface_idx(QSVFramesContext *ctx, QSVFrame *frame)
 
 enum AVPictureType ff_qsv_map_pictype(int mfx_pic_type)
 {
-    enum AVPictureType type;
+    enum AVPictureType type = AV_PICTURE_TYPE_NONE;
     switch (mfx_pic_type & 0x7) {
     case MFX_FRAMETYPE_I:
         if (mfx_pic_type & MFX_FRAMETYPE_S)
@@ -214,6 +215,8 @@ enum AVPictureType ff_qsv_map_pictype(int mfx_pic_type)
         else
             type = AV_PICTURE_TYPE_P;
         break;
+    default:
+        av_assert0(0);
     }
 
     return type;