edac: Do alignment logic properly in edac_align_ptr()

The logic was checking the sizeof the structure being allocated to
determine whether an alignment fixup was required.  This isn't right;
what we actually care about is the alignment of the actual pointer that's
about to be returned.  This became an issue recently because struct
edac_mc_layer has a size that is not zero modulo eight, so we were
taking the correctly-aligned pointer and forcing it to be misaligned.
On Tile this caused an alignment exception.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/edac/edac_mc.c

@@ -164,7 +164,7 @@ void *edac_align_ptr(void **p, unsigned size, int n_elems)
 	else
 		return (char *)ptr;
 
-	r = size % align;
+	r = (unsigned long)p % align;
 
 	if (r == 0)
 		return (char *)ptr;