Draw struct flashchip into struct flashprog_flashctx

We used to have a reference to a dynamically allocated  struct flashchip
inside the flash context. But now that we only ever allocate both in one
go, we can let go of the reference and make it a single structure.

Change-Id: I857acb1def6d133a5cbc28fc7a99b7b1a22b55e0
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/494
diff --git a/fmap.c b/fmap.c
index e8f5b5b..1f17545 100644
--- a/fmap.c
+++ b/fmap.c
@@ -314,7 +314,7 @@
 {
 	int ret;
 
-	if (!flashctx || !flashctx->chip)
+	if (!flashctx)
 		return 1;
 
 	/*