ACPI utils provide acpi_dev_uid_to_integer() helper to extract _UID as
an integer. Use it instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/firmware/efi/dev-path-parser.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c
index eb9c65f97841..113b3ca1bd76 100644
--- a/drivers/firmware/efi/dev-path-parser.c
+++ b/drivers/firmware/efi/dev-path-parser.c

@@ -15,9 +15,11 @@
 static long __init parse_acpi_path(const struct efi_dev_path *node,
                                   struct device *parent, struct device **child)
 {
-       char hid[ACPI_ID_LEN], uid[11]; /* UINT_MAX + null byte */
        struct acpi_device *adev;
        struct device *phys_dev;
+       char hid[ACPI_ID_LEN];
+       long ret;
+       u64 uid;

        if (node->header.length != 12)
                return -EINVAL;

@@ -27,12 +29,12 @@ static long __init parse_acpi_path(const struct efi_dev_path *node,
                'A' + ((node->acpi.hid >>  5) & 0x1f) - 1,
                'A' + ((node->acpi.hid >>  0) & 0x1f) - 1,
                        node->acpi.hid >> 16);
-       sprintf(uid, "%u", node->acpi.uid);

        for_each_acpi_dev_match(adev, hid, NULL, -1) {
-               if (adev->pnp.unique_id && !strcmp(adev->pnp.unique_id, uid))
+               ret = acpi_dev_uid_to_integer(adev, &uid);
+               if (ret == -ENODATA && node->acpi.uid == 0)
                        break;
-               if (!adev->pnp.unique_id && node->acpi.uid == 0)
+               if (ret == 0 && node->acpi.uid == uid)