Fix master compile error

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/crypto/o_str.c b/crypto/o_str.c
index b01128c..84005e6 100644
--- a/crypto/o_str.c
+++ b/crypto/o_str.c
@@ -139,7 +139,7 @@
     if (str == NULL)
         return NULL;
 
-    maxlen = OPENSSL_strnlen(str, s)
+    maxlen = OPENSSL_strnlen(str, s);
 
     ret = CRYPTO_malloc(maxlen + 1, file, line);
     if (ret) {