Staging: speakup: replacing simple_strtoul with kstrtoul

Fix checkpatch warning: WARNING: simple_strtoul is obsolete, use
kstrtoul instead

Signed-off-by: Ashvini Varatharaj <ashvinivaratharaj@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/speakup/kobjects.c b/drivers/staging/speakup/kobjects.c
index f31afa2..e2f597e 100644
--- a/drivers/staging/speakup/kobjects.c
+++ b/drivers/staging/speakup/kobjects.c
@@ -616,7 +616,7 @@
 	int len;
 	char *cp;
 	struct var_t *var_data;
-	int value;
+	long value;
 	unsigned long flags;
 
 	param = spk_var_header_by_name(attr->attr.name);
@@ -638,8 +638,10 @@
 			len = E_INC;
 		else
 			len = E_SET;
-		value = simple_strtol(cp, NULL, 10);
-		ret = spk_set_num_var(value, param, len);
+		if (kstrtol(cp, 10, &value) == 0)
+			ret = spk_set_num_var(value, param, len);
+		else
+			pr_warn("overflow or parsing error has occured");
 		if (ret == -ERANGE) {
 			var_data = param->data;
 			pr_warn("value for %s out of range, expect %d to %d\n",