Fix aml_name_string() to recognize block name modifiers.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/tools/acpi_extract.py b/tools/acpi_extract.py
index 5f613e4..8038269 100755
--- a/tools/acpi_extract.py
+++ b/tools/acpi_extract.py
@@ -121,7 +121,11 @@
     if (aml[offset] != 0x08):
         die( "Name offset 0x%x: expected 0x08 actual 0x%x" %
              (offset, aml[offset]));
-    return offset + 1;
+    offset += 1
+    # Block Name Modifier. Skip it.
+    if (aml[offset] == 0x5c or aml[offset] == 0x5e):
+        offset += 1
+    return offset;
 
 # Given data offset, find dword const offset
 def aml_data_dword_const(offset):