image: Rename load_addr, save_addr, save_size

These global variables are quite short and generic. In fact the same name
is more often used locally for struct members and function arguments.

Add a image_ prefix to make them easier to distinguish.

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

cmd/source.c

@@ -172,7 +172,8 @@ static int do_source(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		addr = CONFIG_SYS_LOAD_ADDR;
 		debug ("*  source: default load address = 0x%08lx\n", addr);
 #if defined(CONFIG_FIT)
-	} else if (fit_parse_subimage (argv[1], load_addr, &addr, &fit_uname)) {
+	} else if (fit_parse_subimage(argv[1], image_load_addr, &addr,
+				      &fit_uname)) {
 		debug ("*  source: subimage '%s' from FIT image at 0x%08lx\n",
 				fit_uname, addr);
 #endif