[PATCH] extcon: fix signedness issues

[Brian Norris <computersforpeace@gmail.com>]

commit be052cc87745 ("extcon: Fix hang and
extcon_get/set_cable_state().") introduced several signedness issues.
sparse reports them:

    drivers/extcon/extcon.c: In function ‘find_cable_index_by_name’:
    drivers/extcon/extcon.c:153:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
    drivers/extcon/extcon.c: In function ‘extcon_get_cable_state’:
    drivers/extcon/extcon.c:384:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
    drivers/extcon/extcon.c: In function ‘extcon_set_cable_state’:
    drivers/extcon/extcon.c:432:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]

Fixes: be052cc87745 ("extcon: Fix hang and extcon_get/set_cable_state().")
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
This is *only* compile-tested

 drivers/extcon/extcon.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 43b57b02d050..a394ca419715 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -126,7 +126,7 @@ static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id
 
 static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
 {
-	unsigned int id = -EINVAL;
+	int id = -EINVAL;
 	int i = 0;
 
 	/* Find the id of extcon cable */
@@ -143,7 +143,7 @@ static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
 
 static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
 {
-	unsigned int id;
+	int id;
 
 	if (edev->max_supported == 0)
 		return -EINVAL;
@@ -378,7 +378,7 @@ EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
  */
 int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
 {
-	unsigned int id;
+	int id;
 
 	id = find_cable_id_by_name(edev, cable_name);
 	if (id < 0)
@@ -426,7 +426,7 @@ EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
 int extcon_set_cable_state(struct extcon_dev *edev,
 			const char *cable_name, bool cable_state)
 {
-	unsigned int id;
+	int id;
 
 	id = find_cable_id_by_name(edev, cable_name);
 	if (id < 0)
-- 
2.5.0.rc2.392.g76e840b