Fix GCC warning "array subscript is above array bounds [-Warray-bounds]"

--- src/core/dmi.cc	2016-05-06 22:17:33.416045355 +0200
+++ src/core/dmi.cc	2016-05-06 22:21:31.694032471 +0200
@@ -511,7 +511,7 @@
   if (num <= 0x0A)
     return _(memory_array_location[num]);
   if (num >= 0xA0 && num < 0xA4)
-    return _(jp_memory_array_location[num]);
+    return _(jp_memory_array_location[num - 0xA0]);
   return "";
 }
 
