misc: sram: fix resource leaks in probe error path

Make sure to disable clocks and deregister any exported partitions
before returning on late probe errors.

Note that since commit ee895ccdf7 ("misc: sram: fix enabled clock leak
on error path"), partitions are deliberately exported before enabling
the clock so we stick to that logic here. A follow up patch will address
this.

Fixes: 2ae2e28852 ("misc: sram: add Atmel securam support")
Cc: stable <stable@vger.kernel.org>     # 4.9
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/sram.c

@@ -407,13 +407,20 @@ static int sram_probe(struct platform_device *pdev)
 	if (init_func) {
 		ret = init_func();
 		if (ret)
-			return ret;
+			goto err_disable_clk;
 	}
 
 	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
 		gen_pool_size(sram->pool) / 1024, sram->virt_base);
 
 	return 0;
+
+err_disable_clk:
+	if (sram->clk)
+		clk_disable_unprepare(sram->clk);
+	sram_free_partitions(sram);
+
+	return ret;
 }
 
 static int sram_remove(struct platform_device *pdev)