avformat/dump.c: fix mixed log levels

Previously a partial log message without newline was printed in case of
loglevel=warning.
Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/dump.c

@@ -422,7 +422,7 @@ static void dump_sidedata(void *ctx, AVStream *st, const char *indent)
             dump_mastering_display_metadata(ctx, &sd);
             break;
         default:
-            av_log(ctx, AV_LOG_WARNING,
+            av_log(ctx, AV_LOG_INFO,
                    "unknown side data type %d (%d bytes)", sd.type, sd.size);
             break;
         }