lavf/showinfo: use error level when get invalid sidedata

Use error level when get invalid sidedata, and remove a unnecessary
newline in error message.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

libavfilter/vf_showinfo.c

@@ -62,7 +62,7 @@ static void dump_spherical(AVFilterContext *ctx, AVFrame *frame, AVFrameSideData
 
     av_log(ctx, AV_LOG_INFO, "spherical information: ");
     if (sd->size < sizeof(*spherical)) {
-        av_log(ctx, AV_LOG_INFO, "invalid data");
+        av_log(ctx, AV_LOG_ERROR, "invalid data");
         return;
     }
 
@@ -100,7 +100,7 @@ static void dump_stereo3d(AVFilterContext *ctx, AVFrameSideData *sd)
 
     av_log(ctx, AV_LOG_INFO, "stereoscopic information: ");
     if (sd->size < sizeof(*stereo)) {
-        av_log(ctx, AV_LOG_INFO, "invalid data");
+        av_log(ctx, AV_LOG_ERROR, "invalid data");
         return;
     }
 
@@ -121,7 +121,7 @@ static void dump_roi(AVFilterContext *ctx, AVFrameSideData *sd)
     roi = (const AVRegionOfInterest *)sd->data;
     roi_size = roi->self_size;
     if (!roi_size || sd->size % roi_size != 0) {
-        av_log(ctx, AV_LOG_ERROR, "Invalid AVRegionOfInterest.self_size.\n");
+        av_log(ctx, AV_LOG_ERROR, "Invalid AVRegionOfInterest.self_size.");
         return;
     }
     nb_rois = sd->size / roi_size;