powerpc: mpc85xx/mpc86xx: Fix off-by-one boundary checking with ARRAY_SIZE

If a variable is used as array subscript, it's valid value range is
0 ... ARRAY_SIZE -1.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/arch/powerpc/cpu/mpc85xx/mpc8548_serdes.c b/arch/powerpc/cpu/mpc85xx/mpc8548_serdes.c
index 76288cd..c9eea15 100644
--- a/arch/powerpc/cpu/mpc85xx/mpc8548_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/mpc8548_serdes.c
@@ -53,7 +53,7 @@
 
 	debug("PORDEVSR[IO_SEL] = %x\n", srds1_cfg);
 
-	if (srds1_cfg > ARRAY_SIZE(serdes1_cfg_tbl)) {
+	if (srds1_cfg >= ARRAY_SIZE(serdes1_cfg_tbl)) {
 		printf("Invalid PORDEVSR[IO_SEL] = %d\n", srds1_cfg);
 		return ;
 	}