Add a NULL check to refineSuites.

Thanks to xiaoshuai for the report.

Author: kareem-wolfssl

src/internal.c

@@ -38025,6 +38025,12 @@ static int AddPSKtoPreMasterSecret(WOLFSSL* ssl)
         word16 i;
         word16 j;
 
+        if (sslSuites == NULL || peerSuites == NULL) {
+            if (outSuites != NULL)
+                outSuites->suiteSz = 0;
+            return;
+        }
+
         XMEMSET(suites, 0, sizeof(suites));
 
         if (!useClientOrder) {