Identical branches in buffer_class

[sminux]

Identical branches in

cbor-ruby/ext/cbor/buffer_class.c

Lines 76 to 80 in 4e8b2ec

	} else if(rb_respond_to(io, s_read)) {
	return s_read;
	} else {
	return s_read;
	}

cbor-ruby/ext/cbor/buffer_class.c

Lines 87 to 90 in 4e8b2ec

	} else if(rb_respond_to(io, s_append)) {
	return s_append;
	} else {
	return s_write;

We can replace 'else if', this improves performance slightly