Input: sentelic - release mutex upon register write failure

Make sure that mutex is released upon register writing failure.
This fixes boot freezing observed on ARM based OLPC
(http://dev.laptop.org/ticket/11357).
Signed-off-by: Paul Fox <pgf@laptop.org>
Signed-off-by: Tai-hwa Liang <avatar@sentelic.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/sentelic.c

@@ -162,7 +162,7 @@ static int fsp_reg_write(struct psmouse *psmouse, int reg_addr, int reg_val)
 	ps2_sendbyte(ps2dev, v, FSP_CMD_TIMEOUT2);
 
 	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
-		return -1;
+		goto out;
 
 	if ((v = fsp_test_invert_cmd(reg_val)) != reg_val) {
 		/* inversion is required */
@@ -261,7 +261,7 @@ static int fsp_page_reg_write(struct psmouse *psmouse, int reg_val)
 	ps2_sendbyte(ps2dev, 0x88, FSP_CMD_TIMEOUT2);
 
 	if (ps2_sendbyte(ps2dev, 0xf3, FSP_CMD_TIMEOUT) < 0)
-		return -1;
+		goto out;
 
 	if ((v = fsp_test_invert_cmd(reg_val)) != reg_val) {
 		ps2_sendbyte(ps2dev, 0x47, FSP_CMD_TIMEOUT2);