riscv: sifive: fu540: redundant initialization

We should not initialize a variable if the value is overwritten before
being read.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Tested-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Rick Chen <rick@andestech.com>

arch/riscv/cpu/fu540/cache.c

@@ -22,7 +22,7 @@ DECLARE_GLOBAL_DATA_PTR;
 int cache_enable_ways(void)
 {
 	const void *blob = gd->fdt_blob;
-	int node = (-FDT_ERR_NOTFOUND);
+	int node;
 	fdt_addr_t base;
 	u32 config;
 	u32 ways;