staging: speakup: fix typo in kobjects.c

Correct spelling typo in kobjects.c
Signed-off-by: Hayato Suzuki <hytszk@gmail.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/kobjects.c

@@ -641,7 +641,7 @@ ssize_t spk_var_store(struct kobject *kobj, struct kobj_attribute *attr,
 		if (kstrtol(cp, 10, &value) == 0)
 			ret = spk_set_num_var(value, param, len);
 		else
-			pr_warn("overflow or parsing error has occured");
+			pr_warn("overflow or parsing error has occurred");
 		if (ret == -ERANGE) {
 			var_data = param->data;
 			pr_warn("value for %s out of range, expect %d to %d\n",