Input: pxa27x - fix keypad KPC macros

We want to mask (key_number - 1), not key_number. The current
implementation works fine for all values but the maximum one,
i.e. 8.
Signed-off-by: NSamuel Ortiz <sameo@openedhand.com>
Acked-by: NEric Miao <eric.miao@marvell.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/keyboard/pxa27x_keypad.c

@@ -50,9 +50,9 @@
 #define KPKDI           0x0048
 
 /* bit definitions */
-#define KPC_MKRN(n)	((((n) & 0x7) - 1) << 26) /* matrix key row number */
-#define KPC_MKCN(n)	((((n) & 0x7) - 1) << 23) /* matrix key column number */
-#define KPC_DKN(n)	((((n) & 0x7) - 1) << 6)  /* direct key number */
+#define KPC_MKRN(n)	((((n) - 1) & 0x7) << 26) /* matrix key row number */
+#define KPC_MKCN(n)	((((n) - 1) & 0x7) << 23) /* matrix key column number */
+#define KPC_DKN(n)	((((n) - 1) & 0x7) << 6)  /* direct key number */
 
 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */