dtc: Remove bogus break statement

Commit 0738774fcc introduced some
incorrect indentation / bracketing in unflatten_tree().  By luck, the
extra break statement intended to be within an if block, but actually
afterwards has no semantic effect.  Still, this patch gets rid of it
for cleanliness.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

flattree.c

@@ -779,7 +779,6 @@ static struct node *unflatten_tree(struct inbuf *dtbuf,
 			if (!(flags & FTF_NOPS))
 				fprintf(stderr, "Warning: NOP tag found in flat tree"
 					" version <16\n");
-				break;
 
 			/* Ignore */
 			break;