Add some missing error codes.

diff --git a/include/dinput.h b/include/dinput.h
index 0385913..af85594 100644
--- a/include/dinput.h
+++ b/include/dinput.h
@@ -177,6 +177,7 @@
 #define DIERR_EFFECTPLAYING             0x80040208L
 #define DIERR_UNPLUGGED                 0x80040209L
 #define DIERR_REPORTFULL                0x8004020AL
+#define DIERR_MAPFILEFAIL               0x8004020BL
 
 #define DIENUM_STOP                     0
 #define DIENUM_CONTINUE                 1