efi_loader: fix comment in ESRT code

There is no variable num_pages in function efi_esrt_allocate_install().

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/efi_esrt.c b/lib/efi_loader/efi_esrt.c
index dcc08a6..7f46d65 100644
--- a/lib/efi_loader/efi_esrt.c
+++ b/lib/efi_loader/efi_esrt.c
@@ -115,7 +115,7 @@
 	u32 size = efi_esrt_entries_to_size(num_entries);
 	efi_guid_t esrt_guid = efi_esrt_guid;
 
-	/* Reserve num_pages for ESRT */
+	/* Reserve memory for ESRT */
 	ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, size,
 				(void **)&new_esrt);