Fix some code scan issues.

Signed-off-by: Zhong Li <zhong.li@intel.com>

Author: lizhong1008

libavcodec/qsvenc.c

@@ -1238,7 +1238,7 @@ static int encode_frame(AVCodecContext *avctx, QSVEncContext *q,
                0 : ff_qsv_print_error(avctx, ret, "Error during encoding");
     }
 
-    if (ret == MFX_WRN_INCOMPATIBLE_VIDEO_PARAM && frame->interlaced_frame)
+    if (ret == MFX_WRN_INCOMPATIBLE_VIDEO_PARAM && frame && frame->interlaced_frame)
         print_interlace_msg(avctx, q);
 
     if (*sync) {

libavfilter/qsvvpp.c

@@ -413,7 +413,7 @@ static int init_vpp_session(AVFilterContext *avctx, QSVVPPContext *s)
     AVHWDeviceContext *device_ctx;
     AVQSVDeviceContext *device_hwctx;
     mfxHDL handle;
-    mfxHandleType handle_type;
+    mfxHandleType handle_type = MFX_HANDLE_D3D9_DEVICE_MANAGER;
     mfxVersion ver;
     mfxIMPL impl;
     int ret, i;

libavfilter/vf_deinterlace_qsv.c

@@ -177,7 +177,7 @@ static int init_out_session(AVFilterContext *ctx)
     int opaque = !!(hw_frames_hwctx->frame_type & MFX_MEMTYPE_OPAQUE_FRAME);
 
     mfxHDL handle = NULL;
-    mfxHandleType handle_type;
+    mfxHandleType handle_type = MFX_HANDLE_D3D9_DEVICE_MANAGER;
     mfxVersion ver;
     mfxIMPL impl;
     mfxVideoParam par;

libavfilter/vf_overlay_qsv.c

@@ -360,7 +360,7 @@ static int setup_layout(AVFilterContext *ctx)
 }
 static int have_alpha_planar(AVFilterLink *link)
 {
-    enum AVPixelFormat pix_fmt;
+    enum AVPixelFormat pix_fmt = link->format;
     const AVPixFmtDescriptor *desc;
     AVHWFramesContext *fctx;
 

libavfilter/vf_scale_qsv.c

@@ -274,7 +274,7 @@ static int init_out_session(AVFilterContext *ctx)
     int opaque = !!(in_frames_hwctx->frame_type & MFX_MEMTYPE_OPAQUE_FRAME);
 
     mfxHDL handle = NULL;
-    mfxHandleType handle_type;
+    mfxHandleType handle_type = MFX_HANDLE_D3D9_DEVICE_MANAGER;
     mfxVersion ver;
     mfxIMPL impl;
     mfxVideoParam par;