Make ->drop_inode() just return whether inode needs to be dropped

... and let iput_final() do the actual eviction or retention

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index 975eedd..6de5a86 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -124,7 +124,7 @@
 }
 
 void ocfs2_evict_inode(struct inode *inode);
-void ocfs2_drop_inode(struct inode *inode);
+int ocfs2_drop_inode(struct inode *inode);
 
 /* Flags for ocfs2_iget() */
 #define OCFS2_FI_FLAG_SYSFILE		0x1