Btrfs: section mismatch warnings

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Hello everybody,

compiling btrfs into the kernel results in section mismatch warnings. __exit
functions are called where they are not allowed to. The attached patch fixes
this for me. Not sure if it is correct though.

Signed-off-by: Christian Hesse <mail@earthworm.de>
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Regards,
Chris

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 2ffc0c7..6e572d3 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -112,7 +112,7 @@
 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
 			  get_extent_t *get_extent);
 int __init extent_map_init(void);
-void __exit extent_map_exit(void);
+void extent_map_exit(void);
 
 u64 count_range_bits(struct extent_map_tree *tree,
 		     u64 *start, u64 max_bytes, unsigned long bits);