efi_loader: address coverity report 492766 for dead code

The check of the return code is already done a few lines above.
Although it doesn't cause any functional issues, remove the superfluous
checks

Addresses-Coverity-ID: 492766 Control flow issues  (DEADCODE)
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/lib/efi_loader/efi_var_mem.c b/lib/efi_loader/efi_var_mem.c
index 940ab66..139e16a 100644
--- a/lib/efi_loader/efi_var_mem.c
+++ b/lib/efi_loader/efi_var_mem.c
@@ -232,8 +232,6 @@
 	efi_var_buf->length = (uintptr_t)efi_var_buf->var -
 			      (uintptr_t)efi_var_buf;
 
-	if (ret != EFI_SUCCESS)
-		return ret;
 	ret = efi_create_event(EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE, TPL_CALLBACK,
 			       efi_var_mem_notify_virtual_address_map, NULL,
 			       NULL, &event);