Change last parameter of umoven() from char* to void*

Saves tons of casts.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/sock.c b/sock.c
index b6fc95c..dc8febc 100644
--- a/sock.c
+++ b/sock.c
@@ -256,7 +256,7 @@
 			struct ifreq ifra[nifra];
 
 			if (umoven(tcp, (unsigned long) ifc.ifc_buf,
-				sizeof(ifra), (char *) ifra) < 0) {
+				sizeof(ifra), ifra) < 0) {
 				tprintf("%lx}", (unsigned long) ifc.ifc_buf);
 				return 1;
 			}