function dtype2c( dtype ) {
	return TABLE[ resolve( dtype ) ] || null;
}
Returns the C data type associated with a provided data type string.

@param {*} dtype - data type value
@returns {(string|null)} C data type

@example
var out = dtype2c( 'float64' );
// returns 'double'

out = dtype2c( 'generic' );
// returns null