avformat/hlsenc: Always treat numbers as decimal

c801ab43c3 caused a regression: The stream
number is now parsed with strtoll without a fixed basis; as a
consequence, the "010" in a variant stream mapping like "a:010" is now
treated as an octal number (i.e. as eight, not ten). This was not
intended and may break some scripts, so this commit restores the old
behaviour.

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

libavformat/hlsenc.c

@@ -1993,7 +1993,7 @@ static int parse_variant_stream_mapstring(AVFormatContext *s)
                 return AVERROR(EINVAL);
             }
 
-            num = strtoll(val, &end, 0);
+            num = strtoll(val, &end, 10);
             if (!av_isdigit(*val) || *end != '\0') {
                 av_log(s, AV_LOG_ERROR, "Invalid stream number: '%s'\n", val);
                 return AVERROR(EINVAL);