mpg123: Don't treat MPG123_NEW_FORMAT as error

Seeking a few of my MP3 files could cause error messages like below.
In fact MPG123_NEW_FORMAT is no real error and can be ignored.

ERROR ../src/mpg123/mpg123.cc:368 [play]:
mpg123 error in file:///home/thomas/Sample.mp3: No error... (code 0)

See also: https://mpg123.de/api/group__mpg123__error.shtml

src/mpg123/mpg123.cc

@@ -361,6 +361,9 @@ bool MPG123Plugin::play(const char * filename, VFSFile & file)
             if (ret == MPG123_DONE || ret == MPG123_ERR_READER)
                 break;
 
+            if (ret == MPG123_NEW_FORMAT)
+                continue;
+
             if (ret < 0)
             {
                 // log only the first error