iphlpapi: add FreeMibTable implementation

[Austin English]

https://bugs.winehq.org/show_bug.cgi?id=36092

-- 
-Austin
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diff --git a/dlls/iphlpapi/iphlpapi.spec b/dlls/iphlpapi/iphlpapi.spec
index c51b58b..94f5529 100644
--- a/dlls/iphlpapi/iphlpapi.spec
+++ b/dlls/iphlpapi/iphlpapi.spec
@@ -66,7 +66,7 @@
 #@ stub FlushIpNetTable2
 @ stub FlushIpNetTableFromStack
 #@ stub FlushIpPathTable
-#@ stub FreeMibTable
+@ stub FreeMibTable( ptr )
 @ stdcall GetAdapterIndex( wstr ptr )
 @ stub GetAdapterOrderMap
 @ stdcall GetAdaptersAddresses( long long ptr ptr ptr )
diff --git a/dlls/iphlpapi/iphlpapi_main.c b/dlls/iphlpapi/iphlpapi_main.c
index c06b69f..43197d4 100644
--- a/dlls/iphlpapi/iphlpapi_main.c
+++ b/dlls/iphlpapi/iphlpapi_main.c
@@ -420,6 +420,23 @@ DWORD WINAPI FlushIpNetTable(DWORD dwIfIndex)
   return ERROR_NOT_SUPPORTED;
 }
 
+/******************************************************************
+ *    FreeMibTable (IPHLPAPI.@)
+ *
+ * Free buffer allocated by network functions
+ *
+ * PARAMS
+ *  ptr     [In] pointer to the buffer to free
+ *
+ * RETURNS
+ *  Success: NO_ERROR
+ *  Failure: error code from winerror.h
+ */
+void WINAPI FreeMibTable (PVOID *ptr)
+{
+  TRACE("(ptr %p): stub\n", ptr);
+  HeapFree(GetProcessHeap(), 0, ptr);
+}
 
 /******************************************************************
  *    GetAdapterIndex (IPHLPAPI.@)