fix compile failure due to no return

Notes:
already done.

Reference: /n/sources/patch/sorry/apreturn0
Date: Sat Mar 10 18:14:53 CET 2012
Signed-off-by: quanstro@quanstro.net
Reviewed-by: geoff

--- /sys/src/ape/lib/ap/plan9/tcgetattr.c	Sat Mar 10 18:14:29 2012
+++ /sys/src/ape/lib/ap/plan9/tcgetattr.c	Sat Mar 10 18:14:28 2012
@@ -144,6 +144,7 @@
 		_syserrno();
 		return -1;
 	}
+	return 0;
 }
 
 pid_t
--- /sys/src/ape/lib/ap/plan9/signal.c	Sat Mar 10 18:14:32 2012
+++ /sys/src/ape/lib/ap/plan9/signal.c	Sat Mar 10 18:14:30 2012
@@ -111,6 +111,7 @@
 	}
 	_doatexits();
 	_NOTED(1); /* NDFLT */
+	return 0;
 }
 
 int