proc: proc_init_inodecache() can't fail

kmem_cache creation code will panic, don't return anything.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

fs/proc/root.c

@@ -104,9 +104,9 @@ static struct file_system_type proc_fs_type = {
 
 void __init proc_root_init(void)
 {
-	int err = proc_init_inodecache();
-	if (err)
-		return;
+	int err;
+
+	proc_init_inodecache();
 	err = register_filesystem(&proc_fs_type);
 	if (err)
 		return;