- error.h does not seem to be used (musl doesnt provide one)
fixes error/handling of FILE *stderr leading to errors like:
miax.c:217:2: error: assignment of read-only variable 'stderr'
stderr=fopen(log_output,"w");
thx to jow for pointing things out
Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>