fs: dcache: Revert "manually unpoison dname after allocation to shut up kasan's reports"

This reverts commit df4c0e36.

It's no longer needed since dentry_string_cmp() now uses
read_word_at_a_time() to avoid kasan's reports.
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/dcache.c

@@ -38,8 +38,6 @@
 #include <linux/prefetch.h>
 #include <linux/ratelimit.h>
 #include <linux/list_lru.h>
-#include <linux/kasan.h>
-
 #include "internal.h"
 #include "mount.h"
 
@@ -1623,9 +1621,6 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
 		}
 		atomic_set(&p->u.count, 1);
 		dname = p->name;
-		if (IS_ENABLED(CONFIG_DCACHE_WORD_ACCESS))
-			kasan_unpoison_shadow(dname,
-				round_up(name->len + 1,	sizeof(unsigned long)));
 	} else  {
 		dname = dentry->d_iname;
 	}