[PATCH] n_tty.c buglet breaks error returns

[Jeff Dike]

The tty SIGIO fix that went into 2.4.19 breaks error returns from the 
underlying driver.  Currently, any errors from the driver causes write_chan
to call schedule() rather than returning the error.

This broke the UML test suite, the fix below makes it work again.

				Jeff

--- orig/drivers/char/n_tty.c	Tue Sep  3 17:07:15 2002
+++ um/drivers/char/n_tty.c	Sat Sep 21 13:22:32 2002
@@ -1180,7 +1180,7 @@
 			while (nr > 0) {
 				ssize_t num = opost_block(tty, b, nr);
 				if (num < 0){
-				        if(num != -EAGAIN)
+				        if(num == -EAGAIN)
 					        break;
 					retval = num;
 					goto break_out;