avformat/avio: Remove redundant checks

Checking the return value of av_opt_set() is equivalent
to the current checks.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/avio.c

@@ -125,10 +125,7 @@ static int url_alloc_for_protocol(URLContext **puc, const URLProtocol *up,
 
                 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
                     *val= *key= 0;
-                    if (strcmp(p, "start") && strcmp(p, "end")) {
-                        ret = AVERROR_OPTION_NOT_FOUND;
-                    } else
-                        ret= av_opt_set(uc->priv_data, p, key+1, 0);
+                    ret = av_opt_set(uc->priv_data, p, key+1, 0);
                     if (ret == AVERROR_OPTION_NOT_FOUND)
                         av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
                     *val= *key= sep;