saner FASYNC handling on file close

As it is, all instances of ->release() for files that have ->fasync()
need to remember to evict file from fasync lists; forgetting that
creates a hole and we actually have a bunch that *does* forget.

So let's keep our lives simple - let __fput() check FASYNC in
file->f_flags and call ->fasync() there if it's been set.  And lose that
crap in ->release() instances - leaving it there is still valid, but we
don't have to bother anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/ipmi/ipmi_devintf.c

@@ -162,8 +162,6 @@ static int ipmi_release(struct inode *inode, struct file *file)
 	if (rv)
 		return rv;
 
-	ipmi_fasync (-1, file, 0);
-
 	/* FIXME - free the messages in the list. */
 	kfree(priv);
 

drivers/char/ipmi/ipmi_watchdog.c

@@ -870,7 +870,6 @@ static int ipmi_close(struct inode *ino, struct file *filep)
 		clear_bit(0, &ipmi_wdog_open);
 	}
 
-	ipmi_fasync(-1, filep, 0);
 	expect_close = 0;
 
 	return 0;