EDAC/amd64: Do not warn when removing instances

On machines which do not populate all nodes with DIMMs, the driver
doesn't initialize an instance there. However, the instance removal
remove_one_instance() path will warn unconditionally, which is wrong.

Remove the WARN_ON() even if the warning is innocent because it causes a
splat in dmesg.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200117115939.5524-1-bp@alien8.de

drivers/edac/amd64_edac.c

@@ -3573,9 +3573,6 @@ static void remove_one_instance(unsigned int nid)
 	struct mem_ctl_info *mci;
 	struct amd64_pvt *pvt;
 
-	mci = find_mci_by_dev(&F3->dev);
-	WARN_ON(!mci);
-
 	/* Remove from EDAC CORE tracking list */
 	mci = edac_mc_del_mc(&F3->dev);
 	if (!mci)