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/p5040_serdes.c b/arch/powerpc/cpu/mpc85xx/p5040_serdes.c
index 890b88e..d646e85 100644
--- a/arch/powerpc/cpu/mpc85xx/p5040_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/p5040_serdes.c
@@ -105,7 +105,7 @@
 {
 	int i;
 
-	if (prtcl > ARRAY_SIZE(serdes_cfg_tbl))
+	if (prtcl >= ARRAY_SIZE(serdes_cfg_tbl))
 		return 0;
 
 	for (i = 0; i < SRDS_MAX_LANES; i++) {