function getKernel( name ) {
	var kernel = kernels[ name ];
	if ( kernel === void 0 ) {
		return new Error( format( 'invalid argument. Unsupported/unrecognized kernel. Value: `%s`.', name ) );
	}
	return kernel;
}
Returns the specified kernel function.

@private
@param {string} name - kernel name
@returns {(Function|Error)} kernel function or corresponding error