CLEANUP: lua: Get rid of obsolete (size_t *) cast in hlua_lua2(smp|arg)

This was required for the `chunk` API (`data` was an int), but is not
required with the `buffer` API.
diff --git a/src/hlua.c b/src/hlua.c
index be959d8..bc6c7f7 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -419,7 +419,7 @@
 
 	case LUA_TSTRING:
 		arg->type = ARGT_STR;
-		arg->data.str.area = (char *)lua_tolstring(L, ud, (size_t *)&arg->data.str.data);
+		arg->data.str.area = (char *)lua_tolstring(L, ud, &arg->data.str.data);
 		/* We don't know the actual size of the underlying allocation, so be conservative. */
 		arg->data.str.size = arg->data.str.data;
 		arg->data.str.head = 0;
@@ -562,7 +562,7 @@
 	case LUA_TSTRING:
 		smp->data.type = SMP_T_STR;
 		smp->flags |= SMP_F_CONST;
-		smp->data.u.str.area = (char *)lua_tolstring(L, ud, (size_t *)&smp->data.u.str.data);
+		smp->data.u.str.area = (char *)lua_tolstring(L, ud, &smp->data.u.str.data);
 		/* We don't know the actual size of the underlying allocation, so be conservative. */
 		smp->data.u.str.size = smp->data.u.str.data;
 		smp->data.u.str.head = 0;