ALSA: firewire-lib: fix uninitialized local variable

Similar to commit d8dc872 ("ALSA: firewire-lib: fix uninitialized
local variable"), the local variable `curr_cycle_time` in
process_rx_packets() is declared without initialization.

When the tracepoint event is not probed, the variable may appear to be
used without being initialized. In practice the value is only relevant
when the tracepoint is enabled, however initializing it avoids potential
use of an uninitialized value and improves code safety.

Initialize `curr_cycle_time` to zero.

Fixes: fef4e61 ("ALSA: firewire-lib: extend tracepoints event including CYCLE_TIME of 1394 OHCI")
Cc: stable@vger.kernel.org
Signed-off-by: Alexey Nepomnyashih <sdl@nppct.ru>
Link: https://patch.msgid.link/20260316191824.83249-1-sdl@nppct.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Alexey Nepomnyashih

sound/firewire/amdtp-stream.c

@@ -1164,7 +1164,7 @@ static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_
 	struct pkt_desc *desc = s->packet_descs_cursor;
 	unsigned int pkt_header_length;
 	unsigned int packets;
-	u32 curr_cycle_time;
+	u32 curr_cycle_time = 0;
 	bool need_hw_irq;
 	int i;