Remove superflous casts.

src/lib/commands/path.c

@@ -102,7 +102,7 @@ path(void)
     snxtsct_area(&ns, &absrange);
     natp = getnatp(player->cnum);
     xyrelrange(natp, &absrange, &relrange);
-    blankfill((s_char *)mapbuf, &ns.range, 3);
+    blankfill(mapbuf, &ns.range, 3);
     for (; *pp; ++pp) {
 	i = diridx(*pp);
 	if (i == DIR_STOP)

src/lib/commands/rout.c

@@ -101,7 +101,7 @@ rout(void)
     natp = getnatp(player->cnum);
     xyrelrange(natp, &ns.range, &relrange);
     memset(mapbuf, 0, ((WORLD_Y * MAPWIDTH(3))));
-    blankfill((s_char *)mapbuf, &ns.range, 3);
+    blankfill(mapbuf, &ns.range, 3);
     border(&relrange, "     ", " ");
 
     while (nxtsct(&ns, &sect)) {

src/lib/commands/sect.c

@@ -89,7 +89,7 @@ sct(void)
     ns.ncond = 0;
     xyrelrange(getnatp(player->cnum), &ns.range, &range);
     border(&range, "    ", "");
-    blankfill((s_char *)mapbuf, &ns.range, 1);
+    blankfill(mapbuf, &ns.range, 1);
     while (nxtsct(&ns, &sect)) {
 	if (!player->owner)
 	    continue;

src/lib/commands/surv.c

@@ -109,7 +109,7 @@ surv(void)
     np = getnatp(player->cnum);
     xyrelrange(np, &nstr.range, &range);
     border(&range, "     ", "");
-    blankfill((s_char *)mapbuf, &nstr.range, 1);
+    blankfill(mapbuf, &nstr.range, 1);
     while (nxtsct(&nstr, &sect)) {
 	if (!player->owner)
 	    continue;

src/lib/commands/wing.c

@@ -64,7 +64,7 @@ wing(void)
     if (!snxtitem(&nstr, EF_PLANE, player->argp[2]))
 	return RET_SYN;
     count = 0;
-    while (nxtitem(&nstr, (s_char *)&plane)) {
+    while (nxtitem(&nstr, &plane)) {
 	if (plane.pln_own != player->cnum)
 	    continue;
 	if (plane.pln_wing == c)