efi_loader: capsule: return a correct error code at find_boot_device()

In case of failure at efi_get_variable_int("BootOrder"), we should
skip examining boot option variables and return an appropriate error
code which is the one the function returned.

Fixes: CID 331153 Code maintainability issues  (UNUSED_VALUE)
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/efi_capsule.c

@@ -685,7 +685,6 @@ skip:
 		efi_free_pool(boot_dev);
 		boot_dev = NULL;
 	}
-out:
 	if (boot_dev) {
 		u16 *path_str;
 
@@ -703,6 +702,7 @@ out:
 	} else {
 		ret = EFI_NOT_FOUND;
 	}
+out:
 	free(boot_order);
 
 	return ret;