* Fixes a potential memory corruption issue identified by rchk. Thanks to Tomas

Kalibera for the associated patch.

* Fixes a crash where`logfmt_log_layout()` would not correctly handle memory

if (len==0||keys==R_NilValue) {

returnR_BlankScalarString;

}

PROTECT(keys);

char*buffer=NULL;

buf_grow(buffer,256);

buf_push(buffer,'\n');

SEXPout=Rf_ScalarString(Rf_mkCharLen(buffer,buf_size(buffer)));

buf_free(buffer);

UNPROTECT(1);

returnout;

}