soc: sifive: ccache: fix missing free_irq() in error path in sifive_ccache_init()

Add missing free_irq() before return error from sifive_ccache_init().

Fixes: a967a289f1 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

drivers/soc/sifive/sifive_ccache.c

@@ -240,7 +240,7 @@ static int __init sifive_ccache_init(void)
 				 NULL);
 		if (rc) {
 			pr_err("Could not request IRQ %d\n", g_irq[i]);
-			goto err_unmap;
+			goto err_free_irq;
 		}
 	}
 
@@ -254,6 +254,9 @@ static int __init sifive_ccache_init(void)
 #endif
 	return 0;
 
+err_free_irq:
+	while (--i >= 0)
+		free_irq(g_irq[i], NULL);
 err_unmap:
 	iounmap(ccache_base);
 	return rc;