More sizeof changes.

A couple more sizeof issues found and fixed.  One of them is
actually another protocol change, but due to a fortuitous accident
it should remain compatible with older versions.

Detailed explanation: When a client attempts to connect to a server that
is already busy, the server is supposed to return ACCESS_DENIED as a
state value.  It was doing so, but was writing it as an int, even though
state values are supposed to be signed chars.  The client read the value
correctly as a signed char, getting one byte and throwing away the rest.
So why did this ever work?  Because ACCESS_DENIED is the value -1, and
any byte of an int -1 equals a signed char -1.  If ACCESS_DENIED had been
any other value, this would have been an opvious bug and would have long
since been fixed.  As is, it stuck around working by accident until now.

src/iperf_server_api.c

@@ -110,7 +110,7 @@ int
 iperf_accept(struct iperf_test *test)
 {
     int s;
-    int rbuf = ACCESS_DENIED;
+    signed char rbuf = ACCESS_DENIED;
     char cookie[COOKIE_SIZE];
     socklen_t len;
     struct sockaddr_storage addr;
@@ -148,7 +148,7 @@ iperf_accept(struct iperf_test *test)
             i_errno = IERECVCOOKIE;
             return -1;
         }
-        if (Nwrite(s, (char*) &rbuf, sizeof(int), Ptcp) < 0) {
+        if (Nwrite(s, (char*) &rbuf, sizeof(rbuf), Ptcp) < 0) {
             i_errno = IESENDMESSAGE;
             return -1;
         }

src/iperf_tcp.c

@@ -96,7 +96,7 @@ iperf_tcp_accept(struct iperf_test * test)
     }
 
     if (strcmp(test->cookie, cookie) != 0) {
-        if (Nwrite(s, (char*) &rbuf, sizeof(signed char), Ptcp) < 0) {
+        if (Nwrite(s, (char*) &rbuf, sizeof(rbuf), Ptcp) < 0) {
             i_errno = IESENDMESSAGE;
             return -1;
         }

src/iperf_util.c

@@ -136,7 +136,7 @@ delay(int64_t ns)
 
     while (nanosleep(&req, &rem) == -1)
         if (EINTR == errno)
-            memcpy(&req, &rem, sizeof rem);
+            memcpy(&req, &rem, sizeof(rem));
         else
             return -1;
     return 0;

src/tcp_window_size.c

@@ -90,7 +90,7 @@ set_tcp_windowsize(int sock, int bufsize, int dir)
          */
 //        printf("Setting TCP buffer to size: %d\n", bufsize);
 	newbufsize = bufsize;
-	rc = setsockopt(sock, SOL_SOCKET, dir, (char *) &newbufsize, sizeof newbufsize);
+	rc = setsockopt(sock, SOL_SOCKET, dir, (char *) &newbufsize, sizeof(newbufsize));
 	if (rc < 0)
 	    return rc;
     } else {