usb: typec: tipd: Prevent uninitialized event{1,2} in IRQ handler

If reading TPS_REG_INT_EVENT1/2 fails in the interrupt handler event1
and event2 may be uninitialized when they are used to determine
IRQ_HANDLED vs. IRQ_NONE in the error path.

Fixes: c7260e2 ("usb: typec: tipd: Add short-circuit for no irqs")
Fixes: 45188f2 ("usb: typec: tipd: Add support for Apple CD321X")
Cc: stable <[email protected]>
Signed-off-by: Sven Peter <[email protected]>
Reviewed-by: Eric Curtin <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Reviewed-by: Guido Günther <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: svenpeter42

drivers/usb/typec/tipd/core.c

@@ -474,7 +474,7 @@ static void tps6598x_handle_plug_event(struct tps6598x *tps, u32 status)
 static irqreturn_t cd321x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
-	u64 event;
+	u64 event = 0;
 	u32 status;
 	int ret;
 
@@ -519,8 +519,8 @@ static irqreturn_t cd321x_interrupt(int irq, void *data)
 static irqreturn_t tps6598x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
-	u64 event1;
-	u64 event2;
+	u64 event1 = 0;
+	u64 event2 = 0;
 	u32 status;
 	int ret;