fix notify_change() potential null dereference.

[Dave Jones]

--- linux-2.6.5/fs/attr.c~	2004-04-16 22:36:00.000000000 +0100
+++ linux-2.6.5/fs/attr.c	2004-04-16 22:36:37.000000000 +0100
@@ -130,7 +130,7 @@
 int notify_change(struct dentry * dentry, struct iattr * attr)
 {
 	struct inode *inode = dentry->d_inode;
-	mode_t mode = inode->i_mode;
+	mode_t mode;
 	int error;
 	struct timespec now = CURRENT_TIME;
 	unsigned int ia_valid = attr->ia_valid;
@@ -138,6 +138,7 @@
 	if (!inode)
 		BUG();
 
+	mode = inode->i_mode;
 	attr->ia_ctime = now;
 	if (!(ia_valid & ATTR_ATIME_SET))
 		attr->ia_atime = now;
-
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