[PATCH] spi: correct bus_num and buffer bug in spi core

Correct the following in driver/spi/spi.c in function spi_busnum_to_master:

 * must allow bus_num 0, the if is really not needed.
 * correct the name buffer which is too small for bus_num >= 10000. It

should be 9 bytes big, not 8.
Signed-off-by: NHans-Christian Egtvedt <hcegtvedt@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/spi/spi.c

@@ -465,15 +465,13 @@ EXPORT_SYMBOL_GPL(spi_unregister_master);
  */
 struct spi_master *spi_busnum_to_master(u16 bus_num)
 {
-	if (bus_num) {
-		char			name[8];
+	char			name[9];
 	struct kobject		*bus;
 
 	snprintf(name, sizeof name, "spi%u", bus_num);
 	bus = kset_find_obj(&spi_master_class.subsys.kset, name);
 	if (bus)
 		return container_of(bus, struct spi_master, cdev.kobj);
-	}
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(spi_busnum_to_master);