avformat/teeproto: Remove always-false check

Incompatibility of the flags and the protocol's capabilities
are checked generically (see url_alloc_for_protocol()).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/teeproto.c

@@ -25,7 +25,6 @@
 #include "libavutil/dict.h"
 #include "libavutil/error.h"
 #include "libavutil/mem.h"
-#include "avio.h"
 #include "tee_common.h"
 #include "url.h"
 
@@ -78,9 +77,6 @@ static int tee_open(URLContext *h, const char *filename, int flags)
 
     av_strstart(filename, "tee:", &filename);
 
-    if (flags & AVIO_FLAG_READ)
-        return AVERROR(ENOSYS);
-
     while (*filename) {
         char *child_string = av_get_token(&filename, child_delim);
         char *child_name = NULL;