oss: fix O_NONBLOCK in dmasound_core

We broke O_NONBLOCK handling in OSS dmasound_core in 2.3.11-pre3 - the
original code copied f_flags to open_mode and then checked for
O_NONBLOCK in there, but that got changed to copying f_mode and
O_NONBLOCK has not reached that field in any kernel version.

Since we do not care for any other bits, the fix is obvious...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

sound/oss/dmasound/dmasound.h

@@ -235,7 +235,7 @@ struct sound_queue {
      */
     int active;
     wait_queue_head_t action_queue, open_queue, sync_queue;
-    fmode_t open_mode;
+    int non_blocking;
     int busy, syncing, xruns, died;
 };
 

sound/oss/dmasound/dmasound_core.c

@@ -603,7 +603,7 @@ static ssize_t sq_write(struct file *file, const char __user *src, size_t uLeft,
 	while (uLeft) {
 		while (write_sq.count >= write_sq.max_active) {
 			sq_play();
-			if (write_sq.open_mode & O_NONBLOCK)
+			if (write_sq.non_blocking)
 				return uWritten > 0 ? uWritten : -EAGAIN;
 			SLEEP(write_sq.action_queue);
 			if (signal_pending(current))
@@ -718,7 +718,7 @@ static int sq_open2(struct sound_queue *sq, struct file *file, fmode_t mode,
 			return rc;
 		}
 
-		sq->open_mode = file->f_mode;
+		sq->non_blocking = file->f_flags & O_NONBLOCK;
 	}
 	return rc;
 }