um: Do not propagate initrd parameter to kernel

This parameter is UML specific. It specifies the name of the file
containing the initrd image, which is unknown to kernel.

Signed-off-by: Tiwei Bie <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Johannes Berg <[e-mail]>

arch/um/kernel/initrd.c

···
 
 static int __init uml_initrd_setup(char *line, int *add)
 {
+	*add = 0;
 	initrd = line;
 	return 0;
 }