Fix segfault with empty fields as last in the config.

Reviewed-by: Tim Hudson <tjh@openssl.org>

crypto/asn1/asn1_gen.c

@@ -279,6 +279,9 @@ static int asn1_cb(const char *elem, int len, void *bitstr)
 
     int tmp_tag, tmp_class;
 
+    if (elem == NULL)
+        return 0;
+
     for (i = 0, p = elem; i < len; p++, i++) {
         /* Look for the ':' in name value pairs */
         if (*p == ':') {

crypto/engine/eng_fat.c

@@ -103,6 +103,8 @@ int ENGINE_set_default(ENGINE *e, unsigned int flags)
 static int int_def_cb(const char *alg, int len, void *arg)
 {
     unsigned int *pflags = arg;
+    if (alg == NULL)
+        return 0;
     if (!strncmp(alg, "ALL", len))
         *pflags |= ENGINE_METHOD_ALL;
     else if (!strncmp(alg, "RSA", len))