Remove superfluous casts to 'void*'

Every non-const pointer converts automatically to it.

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/shadowio.c

@@ -47,7 +47,7 @@ static const char *shadow_getname (const void *ent)
 
 static void *shadow_parse (const char *line)
 {
-	return (void *) sgetspent (line);
+	return sgetspent (line);
 }
 
 static int shadow_put (const void *ent, FILE * file)