platform/x86: amd-pmc: uninitialized variable in amd_pmc_s2d_init()

The "size" variable can be uninitialized if amd_pmc_send_cmd() fails.

Fixes: 3d7d407d ("platform/x86: amd-pmc: Add support for AMD Spill to DRAM STB feature")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220307141832.GA19660@kiliSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd-pmc.c

@@ -708,8 +708,9 @@ static const struct pci_device_id pmc_pci_ids[] = {
 
 static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
 {
-	u32 size, phys_addr_low, phys_addr_hi;
+	u32 phys_addr_low, phys_addr_hi;
 	u64 stb_phys_addr;
+	u32 size = 0;
 
 	/* Spill to DRAM feature uses separate SMU message port */
 	dev->msg_port = 1;