ntfs3: Fix uninit buffer allocated by __getname()

Fix uninit errors caused after buffer allocation given to 'de'; by
initializing the buffer with zeroes. The fix was found by using KMSAN.

Reported-by: syzbot+332bd4e9d148f11a87dc@syzkaller.appspotmail.com
Fixes: 78ab59f ("fs/ntfs3: Rework file operations")
Signed-off-by: Sidharth Seela <sidharthseela@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Author: sidharth-458

fs/ntfs3/inode.c

@@ -1725,6 +1725,7 @@ int ntfs_link_inode(struct inode *inode, struct dentry *dentry)
 	de = __getname();
 	if (!de)
 		return -ENOMEM;
+	memset(de, 0, PATH_MAX);
 
 	/* Mark rw ntfs as dirty. It will be cleared at umount. */
 	ntfs_set_state(sbi, NTFS_DIRTY_DIRTY);