[gnome-battery-bench] SystemInfo: use gbb_str_clean for renderer info

[Christian Kellner <gicmo src gnome org>]

commit af476d1f0897b33b4d81d051e655145b736cafd4
Author: Christian Kellner <gicmo gnome org>
Date:   Tue May 23 19:19:05 2017 +0200

    SystemInfo: use gbb_str_clean for renderer info

 src/system-info.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/system-info.c b/src/system-info.c
index 34425d4..23121ab 100644
--- a/src/system-info.c
+++ b/src/system-info.c
@@ -721,14 +721,13 @@ get_renderer_from_helper (void)
                       &exit_status,
                       &error);
 
-    if (!ok || !g_spawn_check_exit_status(exit_status, &error) ||
-        stdout_str == NULL || stdout_str[0] == '\0') {
+    if (!ok || !g_spawn_check_exit_status(exit_status, &error)) {
         g_warning("Failed to obtain get renderer via helper binary: %s",
                   error->message);
         return NULL;
     }
 
-    return g_strstrip(stdout_str);
+    return gbb_str_clean(stdout_str);
 }
 
 static char *