[vte] Don't allow setting negative row/column size

[Christian Persch <chpe src gnome org>]

commit 9ce477c70120a2a24c32bcacebc28b6e09a63957
Author: Christian Persch <chpe gnome org>
Date:   Tue Mar 30 20:55:47 2010 +0200

    Don't allow setting negative row/column size

 src/pty.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/pty.c b/src/pty.c
index 1630b27..05957cc 100644
--- a/src/pty.c
+++ b/src/pty.c
@@ -642,8 +642,8 @@ vte_pty_set_size(VtePty *pty,
         master = vte_pty_get_fd(pty);
 
 	memset(&size, 0, sizeof(size));
-	size.ws_row = rows ? rows : 24;
-	size.ws_col = columns ? columns : 80;
+	size.ws_row = rows > 0 ? rows : 24;
+	size.ws_col = columns > 0 ? columns : 80;
 	_vte_debug_print(VTE_DEBUG_PTY,
 			"Setting size on fd %d to (%d,%d).\n",
 			master, columns, rows);