mm: trivial: Remove duplicate declaration for migrate_misplaced_page

[Srikar Dronamraju]

Just noticied that e14808b49 added a duplicate extern declaration for
migrate_misplaced_page()
    
Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index a405d3dc..086bd33 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -93,7 +93,6 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
 
 #ifdef CONFIG_NUMA_BALANCING
 extern int migrate_misplaced_page(struct page *page, int node);
-extern int migrate_misplaced_page(struct page *page, int node);
 extern bool migrate_ratelimited(int node);
 #else
 static inline int migrate_misplaced_page(struct page *page, int node)

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