Fix three clang complaints about the DNS code.

These are all already fixed upstream in the same way.

Change-Id: I2881b6d0fbd0237fffc0f00563bc14750dcce0d9

libc/dns/gethnamaddr.c

@@ -90,7 +90,7 @@
 // This should be synchronized to ResponseCode.h
 static const int DnsProxyQueryResult = 222;
 
-static const char const AskedForGot[] =
+static const char AskedForGot[] =
 			  "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
 
 #define	MAXPACKET	(64*1024)

libc/dns/resolv/res_send.c

@@ -1277,8 +1277,6 @@ Aerror(const res_state statp, FILE *file, const char *string, int error,
 	char hbuf[NI_MAXHOST];
 	char sbuf[NI_MAXSERV];
 
-	alen = alen;
-
 	if ((statp->options & RES_DEBUG) != 0U) {
 		if (getnameinfo(address, (socklen_t)alen, hbuf, sizeof(hbuf),
 		    sbuf, sizeof(sbuf), niflags)) {

libc/dns/resolv/res_state.c

@@ -211,10 +211,9 @@ __res_get_state(void)
 }
 
 void
-__res_put_state(res_state res)
+__res_put_state(res_state res __unused)
 {
     /* nothing to do */
-    res=res;
 }
 
 res_static