typo in s_client

Signed-off-by: NKurt Roeckx <kurt@roeckx.be>
Reviewed-by: NGeoff Thorpe <geoff@openssl.org>

apps/s_client.c

@@ -329,7 +329,7 @@ static void sc_usage(void)
 	BIO_printf(bio_err," -srppass arg      - password for 'user'\n");
 	BIO_printf(bio_err," -srp_lateuser     - SRP username into second ClientHello message\n");
 	BIO_printf(bio_err," -srp_moregroups   - Tolerate other than the known g N values.\n");
-	BIO_printf(bio_err," -srp_strength int - minimal mength in bits for N (default %d).\n",SRP_MINIMAL_N);
+	BIO_printf(bio_err," -srp_strength int - minimal length in bits for N (default %d).\n",SRP_MINIMAL_N);
 #endif
 #ifndef OPENSSL_NO_SSL3_METHOD
 	BIO_printf(bio_err," -ssl3         - just use SSLv3\n");