edac: remove arch-specific parameter for the error handler

Remove the arch-dependent parameter, as it were not used,
as the MCE tracepoint weren't implemented. It probably doesn't
make sense to have an MCE-specific tracepoint, as this will
cost more bytes at the tracepoint, and tracepoint is not free.

The changes at the EDAC drivers were done by this small perl script:

	$file .=$_ while (<>);
	$file =~ s/(edac_mc_handle_error)\s*\(([^\;]+)\,([^\,\)]+)\s*\)/$1($2)/g;
	print $file;

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/edac/ppc4xx_edac.c b/drivers/edac/ppc4xx_edac.c
index 5351982..67a2920 100644
--- a/drivers/edac/ppc4xx_edac.c
+++ b/drivers/edac/ppc4xx_edac.c
@@ -730,7 +730,7 @@
 			edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
 					     0, 0, 0,
 					     row, 0, -1,
-					     message, "", NULL);
+					     message, "");
 }
 
 /**
@@ -761,7 +761,7 @@
 			edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
 					     page, offset, 0,
 					     row, 0, -1,
-					     message, "", NULL);
+					     message, "");
 }
 
 /**