don't bother with ->d_inode->i_sb - it's always equal to ->d_sb

... and neither can ever be NULL

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 51c3b06..d818e4f 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -552,7 +552,7 @@
 	 * different read/write sizes for file systems known to have
 	 * problems with large blocks */
 	if (nfserr == 0) {
-		struct super_block *sb = d_inode(argp->fh.fh_dentry)->i_sb;
+		struct super_block *sb = argp->fh.fh_dentry->d_sb;
 
 		/* Note that we don't care for remote fs's here */
 		if (sb->s_magic == MSDOS_SUPER_MAGIC) {
@@ -588,7 +588,7 @@
 	nfserr = fh_verify(rqstp, &argp->fh, 0, NFSD_MAY_NOP);
 
 	if (nfserr == 0) {
-		struct super_block *sb = d_inode(argp->fh.fh_dentry)->i_sb;
+		struct super_block *sb = argp->fh.fh_dentry->d_sb;
 
 		/* Note that we don't care for remote fs's here */
 		switch (sb->s_magic) {