spi: Use kcalloc() in spi_register_board_info()

A multiplication for the size determination of a memory allocation
indicated that an array data structure should be processed.
Thus reuse the corresponding function "kcalloc".

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -672,7 +672,7 @@ int spi_register_board_info(struct spi_board_info const *info, unsigned n)
 	if (!n)
 		return -EINVAL;
 
-	bi = kzalloc(n * sizeof(*bi), GFP_KERNEL);
+	bi = kcalloc(n, sizeof(*bi), GFP_KERNEL);
 	if (!bi)
 		return -ENOMEM;