rombios/tcgbios: initialise size in tcpa_extend_acpi_log

Gcc complains:

tcgbios.c:362:3: error: ‘size’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   memcpy((char *)lasa_last, (char *)entry_ptr, size);

It fails to figure out if size is used in memcpy it is always initialised.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Doug Goldstein <cardoe@cardoe.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

tools/firmware/rombios/32bit/tcgbios/tcgbios.c

@@ -330,7 +330,7 @@ uint32_t tcpa_extend_acpi_log(uint32_t entry_ptr)
 	uint32_t res = 0;
 	unsigned char *lasa_last = tcpa_get_lasa_last_ptr();
 	unsigned char *lasa_base = tcpa_get_lasa_base_ptr();
-	uint32_t size;
+	uint32_t size = 0;
 	uint16_t entry_count = tcpa_acpi.entry_count;
 	struct pcpes *pcpes = (struct pcpes *)entry_ptr;