sandbox: Remove the old memory file later

When debugging sandbox it is sometimes annoying that the memory file is
deleted early on. If sandbox later crashes or we quit (using the
debugger), it is not possible to run it again with the same state since
the memory file is gone.

Remove the old memory file when sandbox exits, instead. Also add debugging
showing the memory filename.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/start.c

@@ -177,7 +177,7 @@ static int sandbox_cmdline_cb_memory(struct sandbox_state *state,
 
 	err = os_read_ram_buf(arg);
 	if (err) {
-		printf("Failed to read RAM buffer\n");
+		printf("Failed to read RAM buffer '%s': %d\n", arg, err);
 		return err;
 	}
 
@@ -314,10 +314,6 @@ int main(int argc, char *argv[])
 	if (ret)
 		goto err;
 
-	/* Remove old memory file if required */
-	if (state->ram_buf_rm && state->ram_buf_fname)
-		os_unlink(state->ram_buf_fname);
-
 	memset(&data, '\0', sizeof(data));
 	gd = &data;
 #if CONFIG_VAL(SYS_MALLOC_F_LEN)

arch/sandbox/cpu/state.c

@@ -393,7 +393,7 @@ int state_uninit(void)
 
 	state = &main_state;
 
-	if (state->write_ram_buf && !state->ram_buf_rm) {
+	if (state->write_ram_buf) {
 		err = os_write_ram_buf(state->ram_buf_fname);
 		if (err) {
 			printf("Failed to write RAM buffer\n");
@@ -408,6 +408,10 @@ int state_uninit(void)
 		}
 	}
 
+	/* Remove old memory file if required */
+	if (state->ram_buf_rm && state->ram_buf_fname)
+		os_unlink(state->ram_buf_fname);
+
 	/* Delete this at the last moment so as not to upset gdb too much */
 	if (state->jumped_fname)
 		os_unlink(state->jumped_fname);