Don't check for a negative SRP extension size

The size of the SRP extension can never be negative (the variable
|size| is unsigned). Therefore don't check if it is less than zero.

RT#3862

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 9c89d29083)

ssl/t1_lib.c

@@ -1134,7 +1134,7 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
         }
 # ifndef OPENSSL_NO_SRP
         else if (type == TLSEXT_TYPE_srp) {
-            if (size <= 0 || ((len = data[0])) != (size - 1)) {
+            if (size == 0 || ((len = data[0])) != (size - 1)) {
                 *al = SSL_AD_DECODE_ERROR;
                 return 0;
             }