efi: Drop error return in efi_carve_out_dt_rsv()

This function currently returns an error code, but never uses it. There is
no function comment so it is not obvious why. Presuambly the error is not
important.

Update the function to explain its purpose and why it ignores the error.
Drop the useful error return value.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

cmd/bootefi.c

@@ -220,8 +220,16 @@ static efi_status_t efi_run_in_hyp(EFIAPI efi_status_t (*entry)(
 }
 #endif
 
-/* Carve out DT reserved memory ranges */
-static efi_status_t efi_carve_out_dt_rsv(void *fdt)
+/*
+ * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
+ *
+ * The mem_rsv entries of the FDT are added to the memory map. Any failures are
+ * ignored because this is not critical and we would rather continue to try to
+ * boot.
+ *
+ * @fdt: Pointer to device tree
+ */
+static void efi_carve_out_dt_rsv(void *fdt)
 {
 	int nr_rsv, i;
 	uint64_t addr, size, pages;
@@ -234,11 +242,10 @@ static efi_status_t efi_carve_out_dt_rsv(void *fdt)
 			continue;
 
 		pages = ALIGN(size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
-		efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
-				   false);
+		if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
+					false))
+			printf("FDT memrsv map %d: Failed to add to map\n", i);
 	}
-
-	return EFI_SUCCESS;
 }
 
 static efi_status_t efi_install_fdt(void *fdt)
@@ -262,10 +269,7 @@ static efi_status_t efi_install_fdt(void *fdt)
 		return EFI_LOAD_ERROR;
 	}
 
-	if (efi_carve_out_dt_rsv(fdt) != EFI_SUCCESS) {
-		printf("ERROR: failed to carve out memory\n");
-		return EFI_LOAD_ERROR;
-	}
+	efi_carve_out_dt_rsv(fdt);
 
 	/* Link to it in the efi tables */
 	ret = efi_install_configuration_table(&efi_guid_fdt, fdt);