run_init_process() error reporting

This function prints the error code returned by execve.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

init/main.c

@@ -726,8 +726,11 @@ static void __init do_pre_smp_initcalls(void)
 
 static void run_init_process(char *init_filename)
 {
+	long ret;
+
 	argv_init[0] = init_filename;
-	kernel_execve(init_filename, argv_init, envp_init);
+	ret = kernel_execve(init_filename, argv_init, envp_init);
+	printk(KERN_INFO "%s exit code: %ld\n", init_filename, ret);
 }
 
 /* This is a non __init function. Force it to be noinline otherwise gcc