Fix return formatting.

Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/7564)

(cherry picked from commit 2087028612027368e9508e1b253aab715a5a35d6)

ssl/ssl_lib.c

@@ -5106,7 +5106,8 @@ static int nss_keylog_int(const char *prefix,
     size_t i;
     size_t prefix_len;
 
-    if (ssl->ctx->keylog_callback == NULL) return 1;
+    if (ssl->ctx->keylog_callback == NULL)
+        return 1;
 
     /*
      * Our output buffer will contain the following strings, rendered with