Squashfs: move zlib decompression wrapper code into a separate file

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index 0e9feb6..ba87db6 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -70,6 +70,10 @@
 				unsigned int);
 extern int squashfs_read_inode(struct inode *, long long);
 
+/* zlib_wrapper.c */
+extern int squashfs_zlib_uncompress(struct squashfs_sb_info *, void **,
+				struct buffer_head **, int, int, int, int, int);
+
 /*
  * Inodes and files operations
  */