fs: pipe: reveal missing function protoypes

A couple of functions from fs/pipe.c are used both internally
and for the watch queue code, but the declaration is only
visible when the latter is enabled:

fs/pipe.c:1254:5: error: no previous prototype for 'pipe_resize_ring'
fs/pipe.c:758:15: error: no previous prototype for 'account_pipe_buffers'
fs/pipe.c:764:6: error: no previous prototype for 'too_many_pipe_buffers_soft'
fs/pipe.c:771:6: error: no previous prototype for 'too_many_pipe_buffers_hard'
fs/pipe.c:777:6: error: no previous prototype for 'pipe_is_unprivileged_user'

Make the visible unconditionally to avoid these warnings.

Fixes: c73be61c ("pipe: Add general notification queue support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Message-Id: <20230516195629.551602-1-arnd@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

include/linux/pipe_fs_i.h

@@ -261,18 +261,14 @@ void generic_pipe_buf_release(struct pipe_inode_info *, struct pipe_buffer *);
 
 extern const struct pipe_buf_operations nosteal_pipe_buf_ops;
 
-#ifdef CONFIG_WATCH_QUEUE
 unsigned long account_pipe_buffers(struct user_struct *user,
 				   unsigned long old, unsigned long new);
 bool too_many_pipe_buffers_soft(unsigned long user_bufs);
 bool too_many_pipe_buffers_hard(unsigned long user_bufs);
 bool pipe_is_unprivileged_user(void);
-#endif
 
 /* for F_SETPIPE_SZ and F_GETPIPE_SZ */
-#ifdef CONFIG_WATCH_QUEUE
 int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots);
-#endif
 long pipe_fcntl(struct file *, unsigned int, unsigned long arg);
 struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice);