Add LICENSE file and mention in README.md

LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+Copyright (C) 2012 Salvatore Sanfilippo.  All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

README.md

@@ -113,3 +113,8 @@ CREDITS
 This library was written by Salvatore Sanfilippo for Redis, but is maintained as a separated project by the author.
 
 Some of the test vectors in "test.lua" are obtained from the Javascript [MessagePack-JS library](https://github.com/cuzic/MessagePack-JS).
+
+LICENSE
+---
+The library is published under the MIT License. See separate LICENSE file.
+

lua_cmsgpack.c

@@ -783,7 +783,7 @@ void mp_decode_to_lua_type(lua_State *L, mp_cur *c) {
     }
 }
 
-int mp_unpack_full(lua_State *L, int limit, int offset) {
+int mp_unpack_full(lua_State *L, int limit, size_t offset) {
     size_t len;
     const char *s;
     mp_cur c;
@@ -888,7 +888,7 @@ const struct luaL_Reg cmds[] = {
 };
 
 int luaopen_create(lua_State *L) {
-    int i;
+    unsigned i;
     /* Manually construct our module table instead of
      * relying on _register or _newlib */
     lua_newtable(L);
@@ -923,7 +923,7 @@ LUALIB_API int luaopen_cmsgpack(lua_State *L) {
 }
 
 LUALIB_API int luaopen_cmsgpack_safe(lua_State *L) {
-    int i;
+    unsigned i;
 
     luaopen_cmsgpack(L);