returns the default value (80) when a real value is not available
(0 is not an acceptable value for COLUMNS, the width of the screen).

see pull request on upstream : http://github.com/antirez/linenoise/pull/31

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>

Index: b/linenoise.c
===================================================================
--- a/linenoise.c
+++ b/linenoise.c
@@ -182,7 +182,7 @@
 static int getColumns(void) {
     struct winsize ws;
 
-    if (ioctl(1, TIOCGWINSZ, &ws) == -1) return 80;
+    if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) return 80;
     return ws.ws_col;
 }