Ticket #2229: patchdebugswsdst

diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index bb90819..7c4104f 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -801,6 +801,7 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
     const uint8_t *src2[4];
     uint8_t *dst2[4];
     uint8_t *rgb0_tmp = NULL;
+av_log(NULL, AV_LOG_ERROR, "sws_scale() begin - dst: %p, dst[-1]: %d \n", dst[0], dst[0][-1]);

     if (!srcSlice || !dstStride || !dst || !srcSlice) {
         av_log(c, AV_LOG_ERROR, "One of the input parameters to sws_scale() is NULL, please check the calling code\n");
@@ -969,6 +970,7 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
     }

     av_free(rgb0_tmp);
+av_log(NULL, AV_LOG_ERROR, "sws_scale() end   - dst: %p, dst[-1]: %d \n", dst[0], dst[0][-1]);
     return ret;
 }