[libglnx] glnx-console: Add missing NULL check before writing out text

[Philip Withnall <pwithnall src gnome org>]

commit 1893c1ff748ee39f33e7eef1c833ce47897ff95d
Author: Philip Withnall <withnall endlessm com>
Date:   Tue Aug 15 12:04:45 2017 +0100

    glnx-console: Add missing NULL check before writing out text
    
    It’s possible that text is NULL on this path.
    
    Coverity CID: 1376570
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glnx-console.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/glnx-console.c b/glnx-console.c
index cf5409c..785f348 100644
--- a/glnx-console.c
+++ b/glnx-console.c
@@ -222,7 +222,8 @@ text_percent_internal (const char *text,
 
   if (percentage == -1)
     {
-      fwrite (text, 1, input_textlen, stdout);
+      if (text != NULL)
+        fwrite (text, 1, input_textlen, stdout);
 
       /* Overwrite remaining space, if any */
       if (ncolumns > input_textlen)