qcacld-3.0: Change argument data type from int to unsigned int

kstrtou32() expects 3rd argument to be of data type unsigned int,
but currently argument of type int is passed.
Fix this by changing int to unsigned int.

Change-Id: I9ee73a67ab609fe646877db3c967f9972dacc988
CRs-Fixed: 2425520

core/hdd/src/wlan_hdd_ioctl.c

@@ -2170,8 +2170,8 @@ static int hdd_get_dwell_time(struct wlan_objmgr_psoc *psoc, uint8_t *command,
 static int hdd_set_dwell_time(struct wlan_objmgr_psoc *psoc, uint8_t *command)
 {
 	uint8_t *value = command;
-	int val = 0, temp = 0;
-	int retval = 0;
+	int retval = 0, temp = 0;
+	uint32_t val = 0;
 
 	if (!psoc) {
 		hdd_err("psoc is null");