clean unnecessary code: don't check g_strdup arg for NULL

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/vl.c b/vl.c
index 6e6225f..be0a93c 100644
--- a/vl.c
+++ b/vl.c
@@ -1215,7 +1215,7 @@
 
     node = g_malloc0(sizeof(FWBootEntry));
     node->bootindex = bootindex;
-    node->suffix = suffix ? g_strdup(suffix) : NULL;
+    node->suffix = g_strdup(suffix);
     node->dev = dev;
 
     QTAILQ_FOREACH(i, &fw_boot_order, link) {