wt-status: fix possible use of uninitialized variable

In wt_status_print_change_data, we accept a change_type flag
that is meant to be either WT_STATUS_UPDATED or
WT_STATUS_CHANGED.  We then switch() on this value to set
the local variable "status" for each case, but do not
provide a fallback "default" label to the switch statement.

As a result, the compiler realizes that "status" might be
unset, and complains with a warning. To silence this
warning, we use the "int status = status" trick.  This is
correct with the current code, as all callers provide one of
the two expected change_type flags. However, it's also a
maintenance trap, as there is nothing to prevent future
callers from passing another flag, nor to document this
assumption.

Instead of using the "x = x" hack, let's handle the default
case in the switch() statement with a die("BUG"). That tells
the compiler and any readers of the code exactly what the
function's input assumptions are.

We could also convert the flag to an enum, which would
provide a compile-time check on the function input. However,
since these flags are part of a larger enum, that would make
the code unnecessarily complex (we would have to make a new
enum with just the two flags, and then convert it to the old
enum for passing to sub-functions).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

wt-status.c

@@ -264,7 +264,7 @@ static void wt_status_print_change_data(struct wt_status *s,
 {
 	struct wt_status_change_data *d = it->util;
 	const char *c = color(change_type, s);
-	int status = status;
+	int status;
 	char *one_name;
 	char *two_name;
 	const char *one, *two;
@@ -292,6 +292,9 @@ static void wt_status_print_change_data(struct wt_status *s,
 		}
 		status = d->worktree_status;
 		break;
+	default:
+		die("BUG: unhandled change_type %d in wt_status_print_change_data",
+		    change_type);
 	}
 
 	one = quote_path(one_name, -1, &onebuf, s->prefix);