Another portability fix.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

apps/s_client.c

diff --git a/apps/s_client.c b/apps/s_client.c
index 152b0fb..05b626f 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -559,7 +559,7 @@
     static uint8_t selector;
     static uint8_t mtype;
     static unsigned char *data;
-    static tlsa_field tlsa_fields[] = {
+    static struct tlsa_field tlsa_fields[] = {
         { &usage, "usage", checked_uint8 },
         { &selector, "selector", checked_uint8 },
         { &mtype, "mtype", checked_uint8 },