[PATCH] minor SPI doc fix

 *

 * This call is used only by SPI master controller drivers, which are the

 * only ones directly touching chip registers.  It's how they allocate

 * an spi_master structure, prior to calling spi_add_master().

 * an spi_master structure, prior to calling spi_register_master().

 *

 * This must be called from context that can sleep.  It returns the SPI

 * master structure on success, else NULL.

 *

 * The caller is responsible for assigning the bus number and initializing

 * the master's methods before calling spi_add_master(); and (after errors

 * the master's methods before calling spi_register_master(); and (after errors

 * adding the device) calling spi_master_put() to prevent a memory leak.

 */

struct spi_master * __init_or_module