dts: Fix get_compat when parent compat is a list

When a DTS node has no 'compatible' property and its parent node has a
list for its compatible property, return only the first element of the
parent's compatible list.

Signed-off-by: Nathaniel Graff <nathaniel.graff@sifive.com>

scripts/dts/extract/globals.py

@@ -81,12 +81,12 @@ def get_compat(node_address):
         if 'props' in reduced[node_address].keys():
             compat = reduced[node_address]['props'].get('compatible')
 
-        if isinstance(compat, list):
-            compat = compat[0]
-
         if compat == None:
             compat = find_parent_prop(node_address, 'compatible')
 
+        if isinstance(compat, list):
+            compat = compat[0]
+
     except:
         pass