Remove unused enum from dtc.h.
diff --git a/dtc.h b/dtc.h
index 0f68150..354dbdf 100644
--- a/dtc.h
+++ b/dtc.h
@@ -193,11 +193,6 @@
 
 /* Flattened trees */
 
-enum flat_dt_format {
-	FFMT_BIN,
-	FFMT_ASM,
-};
-
 void write_dt_blob(FILE *f, struct boot_info *bi, int version);
 void write_dt_asm(FILE *f, struct boot_info *bi, int version);