Sanity check EVP_EncodeUpdate buffer len

There was already a sanity check to ensure the passed buffer length is not
zero. Extend this to ensure that it also not negative. Thanks to Kevin
Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3 Solutions) for
reporting this issue.

Reviewed-by: Andy Polyakov <appro@openssl.org>

crypto/evp/encode.c

@@ -137,7 +137,7 @@ void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
     unsigned int total = 0;
 
     *outl = 0;
-    if (inl == 0)
+    if (inl <= 0)
         return;
     OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
     if ((ctx->num + inl) < ctx->length) {