Fix memory corruption caused by nfsd readdir+

Commit 8177e6d ("nfsd: clean up
readdirplus encoding") introduced single character typo in nfs3 readdir+
implementation.  Unfortunately that typo has quite bad side effects:
random memory corruption, followed (on my box) with immediate
spontaneous box reboot.

Using 'p1' instead of 'p' fixes my Linux box rebooting whenever VMware
ESXi box tries to list contents of my home directory.

Signed-off-by: Petr Vandrovec <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

fs/nfsd/nfs3xdr.c

@@ -958,7 +958,7 @@ encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 		p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 
 		if (plus)
-			p = encode_entryplus_baggage(cd, p1, name, namlen);
+			p1 = encode_entryplus_baggage(cd, p1, name, namlen);
 
 		/* determine entry word length and lengths to go in pages */
 		num_entry_words = p1 - tmp;