clk: ux500: fix a possible off-by-one in u8500_prcc_reset_base()

Off-by-one will happen when index == ARRAY_SIZE(ur->base).

Fixes: b14cbdfd467d ("clk: ux500: Add driver for the reset portions of PRCC")
Signed-off-by: Hangyu Hua <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Linus Walleij <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/ux500/reset-prcc.c

···
 	prcc_num = id / PRCC_PERIPHS_PER_CLUSTER;
 	index = prcc_num_to_index(prcc_num);
 
-	if (index > ARRAY_SIZE(ur->base))
+	if (index >= ARRAY_SIZE(ur->base))
 		return NULL;
 
 	return ur->base[index];