efi/libstub: Simplify efi_get_memory_map()

Do not check the value of status twice.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Link: https://lore.kernel.org/r/20200216184050.3100-1-xypron.glpk@gmx.deSigned-off-by: Ard Biesheuvel <ardb@kernel.org>

drivers/firmware/efi/libstub/mem.c

@@ -52,13 +52,14 @@ efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
 		goto again;
 	}
 
-	if (status != EFI_SUCCESS)
-		efi_bs_call(free_pool, m);
-
-	if (map->key_ptr && status == EFI_SUCCESS)
+	if (status == EFI_SUCCESS) {
+		if (map->key_ptr)
 			*map->key_ptr = key;
-	if (map->desc_ver && status == EFI_SUCCESS)
+		if (map->desc_ver)
 			*map->desc_ver = desc_version;
+	} else {
+		efi_bs_call(free_pool, m);
+	}
 
 fail:
 	*map->map = m;