Fix a warning in bsearch(). Like index() etc, it de-qualifies its

arguments.  Caveat Emptor.  However, the only two consumer of it (cam)
deals with it correctly and preserves the constness.

sys/libkern/bsearch.c

@@ -74,7 +74,7 @@ bsearch(key, base0, nmemb, size, compar)
 		p = base + (lim >> 1) * size;
 		cmp = (*compar)(key, p);
 		if (cmp == 0)
-			return ((void *)p);
+			return ((void *)(uintptr_t)p);
 		if (cmp > 0) {	/* key > p: move right */
 			base = (const char *)p + size;
 			lim--;