Memory leak in Davix 0.8.11

[amadio]

Commit c47c9ee introduced a change moving a buffer from the stack into the heap. Unfortunately, between the call to malloc to allocate the buffer, and the call to free to release it, there is a place where an exception can be thrown and leak memory:

davix/src/fileops/davmeta.cpp

Lines 198 to 208 in 3054c82

	buffer = (char*)malloc(s_buff+1);
	const dav_ssize_t ret = req->readSegment(buffer, s_buff, &tmp_err);
	checkDavixError(&tmp_err);
	if(ret >= 0){
	buffer[ret]= '\0';
	parser->parseChunk(buffer, ret);
	}else{
	throw DavixException(scope, StatusCode::UnknownError, "Unknown readSegment error");
	}
	free(buffer);