clk: xgene: Fix mapping leak in xgene_pllclk_init()

If xgene_register_clk_pll() fails, the mapped register block is never
unmapped.

Fixes: 308964caee ("clk: Add APM X-Gene SoC clock driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-xgene.c

@@ -188,6 +188,8 @@ static void xgene_pllclk_init(struct device_node *np, enum xgene_pll_type pll_ty
 		of_clk_add_provider(np, of_clk_src_simple_get, clk);
 		clk_register_clkdev(clk, clk_name, NULL);
 		pr_debug("Add %s clock PLL\n", clk_name);
+	} else {
+		iounmap(reg);
 	}
 }