feature/pgtk 175ebb0: Don't crash if we can't find a monitor model name

[Robert Pluim]

branch: feature/pgtk
commit 175ebb010477ff0e174fe5145154397f43dee2d2
Author: Robert Pluim <rpluim@gmail.com>
Commit: Robert Pluim <rpluim@gmail.com>

    Don't crash if we can't find a monitor model name
    
    This can happen when running emacs over a forwarded X11 connection.
    
    * src/pgtkfns.c (pgtk_get_monitor_scale_factor): Return 0 if we're
    passed a NULL model name.
---
 src/pgtkfns.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index cee24c1..07636a2 100644
--- a/src/pgtkfns.c
+++ b/src/pgtkfns.c
@@ -66,6 +66,9 @@ static Lisp_Object monitor_scale_factor_alist;
 static double
 pgtk_get_monitor_scale_factor (const char *model)
 {
+  if (model == NULL)
+    return 0.0;
+
   Lisp_Object mdl = build_string (model);
   Lisp_Object tem = Fassoc(mdl, monitor_scale_factor_alist, Qnil);
   if (NILP (tem))