avformat/avio: Remove no-op code in url_find_protocol().

In url_find_protocol(), proto_str is either "file" or a string
consisting of only the characters in URL_SCHEME_CHARS, which does not
include ','. Therefore the strchr(proto_str, ',') call always returns
NULL.

Note: The code was added in commit
6161c41817.

Signed-off-by: Wan-Teh Chang <wtc@google.com>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>

libavformat/avio.c

@@ -263,8 +263,6 @@ static const struct URLProtocol *url_find_protocol(const char *filename)
         av_strlcpy(proto_str, filename,
                    FFMIN(proto_len + 1, sizeof(proto_str)));
 
-    if ((ptr = strchr(proto_str, ',')))
-        *ptr = '\0';
     av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
     if ((ptr = strchr(proto_nested, '+')))
         *ptr = '\0';