datasize needs to be 64-bits always when using fallback vars code.

Right now it's "unsigned long" which means 32-bits on -m32 builds;
kernel will reject that, and rightly so.

Signed-off-by: Peter Jones <[email protected]>

src/vars.c

@@ -34,7 +34,7 @@
 typedef struct efi_variable_t {
 	uint16_t	VariableName[1024/sizeof(uint16_t)];
 	efi_guid_t	VendorGuid;
-	unsigned long	DataSize;
+	uint64_t	DataSize;
 	uint8_t		Data[1024];
 	efi_status_t	Status;
 	uint32_t	Attributes;