ACPI: MRRM: Check revision of MRRM table

Before trying to parse the MRRM table, check that the table revision
is the one that is expected.

Fixes: b9020bdb9f76 ("ACPI: MRRM: Minimal parse of ACPI MRRM table")
Signed-off-by: Tony Luck <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/acpi_mrrm.c

···
 	if (!mrrm)
 		return -ENODEV;
 
+	if (mrrm->header.revision != 1)
+		return -EINVAL;
+
 	if (mrrm->flags & ACPI_MRRM_FLAGS_REGION_ASSIGNMENT_OS)
 		return -EOPNOTSUPP;