afs: Fix signal handling in some file ops

afs_mkdir(), afs_create(), afs_link() and afs_symlink() all need to drop
the target dentry if a signal causes the operation to be killed immediately
before we try to contact the server.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/dir.c

@@ -818,6 +818,8 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1006,6 +1008,8 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1071,6 +1075,8 @@ static int afs_link(struct dentry *from, struct inode *dir,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1130,6 +1136,8 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);