clk: nomadik: fix multiplatform problem

The Nomadik debugfs screws up multiplatform boots if debugfs
is enabled on the multiplatform image, since it's a simple
initcall that is unconditionally executed and reads from certain
memory locations.

Fix this by checking that the driver has been properly
initialized, so a base offset to the Nomadik SRC controller
exists, before proceeding to register debugfs files.

Reported-by: Andrew Lunn <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Mike Turquette <[e-mail]>

drivers/clk/clk-nomadik.c

···
 
 static int __init nomadik_src_clk_init_debugfs(void)
 {
+	/* Vital for multiplatform */
+	if (!src_base)
+		return -ENODEV;
 	src_pcksr0_boot = readl(src_base + SRC_PCKSR0);
 	src_pcksr1_boot = readl(src_base + SRC_PCKSR1);
 	debugfs_create_file("nomadik-src-clk", S_IFREG | S_IRUGO,