tools/mkimage: Remove duplicate line of code

Recent commits 1a99de2cb4 and
6a590c5f5f both fixed the same bug in the
same manner.  Unfortunately git was "smart" enough to merge both changes
which resulted in some duplicate code.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

Reordered code and comment a bit.

Signed-off-by: Wolfgang Denk <wd@denx.de>

tools/mkimage.c

@@ -229,15 +229,13 @@ main (int argc, char **argv)
 			case 'f':
 				if (--argc <= 0)
 					usage ();
-				params.type = IH_TYPE_FLATDT;
-				params.datafile = *++argv;
-				params.fflag = 1;
-
 				/*
 				 * The flattened image tree (FIT) format
 				 * requires a flattened device tree image type
 				 */
 				params.type = IH_TYPE_FLATDT;
+				params.datafile = *++argv;
+				params.fflag = 1;
 				goto NXTARG;
 			case 'n':
 				if (--argc <= 0)