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

Saves tons of casts.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/kexec.c b/kexec.c
index e277668..6bec51c 100644
--- a/kexec.c
+++ b/kexec.c
@@ -58,8 +58,7 @@
 	for (i = 0; i < len; ++i) {
 		if (i)
 			tprints(", ");
-		if (umoven(tcp, addr + i * sizeof_seg, sizeof_seg,
-			   (char *) &seg) < 0) {
+		if (umoven(tcp, addr + i * sizeof_seg, sizeof_seg, &seg) < 0) {
 			tprints("?");
 			failed = 1;
 			break;