fix memory leak in resolver

src/core/ngx_resolver.c

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 2b53ee0..116734b 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -1149,6 +1149,8 @@
         goto failed;
     }
 
+    ngx_resolver_free(r, name.data);
+
     if (code == 0 && nan == 0) {
         code = 3; /* NXDOMAIN */
     }
@@ -1400,6 +1402,8 @@
 
     /* unlock name mutex */
 
+    ngx_resolver_free(r, name.data);
+
     return;
 }