clocksource/driver/arm_global_timer: Remove unnecessary ‘0’ values from err

The 'err' variable is initialized whatever the code path, it is
pointless to initialize it when it is declared.
Signed-off-by: Li kunyu <kunyu@nfschina.com>
Link: https://lore.kernel.org/r/20240705052159.22235-1-kunyu@nfschina.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/arm_global_timer.c

@@ -343,7 +343,7 @@ static int __init global_timer_of_register(struct device_node *np)
 {
 	struct clk *gt_clk;
 	static unsigned long gt_clk_rate;
-	int err = 0;
+	int err;
 
 	/*
 	 * In A9 r2p0 the comparators for each processor with the global timer