Fix UDF-FS potentially dereferencing null

[Dave Jones]

Move size instantiation after null check for 'dir', nearer
to where its first used.

		Dave

--- linux-2.6.5/fs/udf/namei.c~	2004-04-16 22:38:28.000000000 +0100
+++ linux-2.6.5/fs/udf/namei.c	2004-04-16 22:39:25.000000000 +0100
@@ -159,7 +159,7 @@
 	char *nameptr;
 	uint8_t lfi;
 	uint16_t liu;
-	loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+	loff_t size;
 	lb_addr bloc, eloc;
 	uint32_t extoffset, elen, offset;
 	struct buffer_head *bh = NULL;
@@ -202,6 +202,8 @@
 		return NULL;
 	}
 
+	size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+
 	while ( (f_pos < size) )
 	{
 		fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
-
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