libavformat/mpjpeg: use "ffmpeg" instead of "ffserver" as boundary tag

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

libavformat/mpjpeg.c

@@ -23,7 +23,7 @@
 
 /* Multipart JPEG */
 
-#define BOUNDARY_TAG "ffserver"
+#define BOUNDARY_TAG "ffmpeg"
 
 typedef struct MPJPEGContext {
     AVClass *class;