cifs: missing null check for newinode pointer

in cifs_do_create we check if newinode is valid before referencing it
but are missing the check in one place in fs/cifs/dir.c

Addresses-Coverity: 1357292 ("Dereference after null check")
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/dir.c

@@ -384,10 +384,11 @@ cifs_create_set_dentry:
 		goto out_err;
 	}
 
-	if (S_ISDIR(newinode->i_mode)) {
-		rc = -EISDIR;
-		goto out_err;
-	}
+	if (newinode)
+		if (S_ISDIR(newinode->i_mode)) {
+			rc = -EISDIR;
+			goto out_err;
+		}
 
 	d_drop(direntry);
 	d_add(direntry, newinode);