Allow bootstrapping for multiple images

When bootstrapping all images could have the primary slot erased

Signed-off-by: Karl Kristian Dyrholm Torp <kdt@polytech.com>

Author: KarlKTorp

boot/bootutil/src/loader.c

@@ -1929,8 +1929,7 @@ boot_prepare_image_for_update(struct boot_loader_state *state,
         rc = boot_read_image_headers(state, !boot_status_is_reset(bs), bs);
 #ifdef MCUBOOT_BOOTSTRAP
         /* When bootstrapping it's OK to not have image magic in the primary slot */
-        if (rc != 0 && (BOOT_CURR_IMG(state) != BOOT_PRIMARY_SLOT ||
-                boot_check_header_erased(state, BOOT_PRIMARY_SLOT) != 0)) {
+        if (rc != 0 && boot_check_header_erased(state, BOOT_PRIMARY_SLOT) != 0) {
 #else
         if (rc != 0) {
 #endif