caja-autorun: avoid NULL in 'memcpy'

Fixes Clang static analyzer warning:

caja-autorun.c:139:5: warning: Null pointer passed as an argument to a 'nonnull' parameter
    memcpy (r, v, len * sizeof (char *));
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 files changed, 4 insertions, 1 deletions

diff --git a/libcaja-private/caja-autorun.c b/libcaja-private/caja-autorun.c
index e60fe8a6..04033445 100644
--- a/libcaja-private/caja-autorun.c
+++ b/libcaja-private/caja-autorun.c
@@ -136,7 +136,10 @@ add_elem_to_str_array (char **v, const char *s)
 
     len = v != NULL ? g_strv_length (v) : 0;
     r = g_new0 (char *, len + 2);
-    memcpy (r, v, len * sizeof (char *));
+
+    if (v)
+        memcpy (r, v, len * sizeof (char *));
+
     r[len] = g_strdup (s);
     r[len+1] = NULL;
     g_free (v);