Fix FIONREAD related issues

* Network stack socket module: socket_control(): The FIONREAD argument
  is int, not ssize_t.
* Net kit: getsockopt(): R5_SO_FIONREAD: Fix ioctl() argument. Was
  taking a pointer of what already was a pointer to the buffer.
* libedit: el_gets(): The FIONREAD argument is int, not long.

src/add-ons/kernel/network/stack/net_socket.cpp

@@ -550,17 +550,18 @@ socket_control(net_socket* socket, int32 op, void* data, size_t length)
 			if (data == NULL)
 				return B_BAD_VALUE;
 
-			ssize_t available = socket_read_avail(socket);
+			int available = (int)socket_read_avail(socket);
-			if (available < B_OK)
+			if (available < 0)
 				return available;
 
 			if (is_syscall()) {
 				if (!IS_USER_ADDRESS(data)
-					|| user_memcpy(data, &available, sizeof(ssize_t)) != B_OK) {
+					|| user_memcpy(data, &available, sizeof(available))
+						!= B_OK) {
 					return B_BAD_ADDRESS;
 				}
 			} else
-				*(ssize_t *)data = available;
+				*(int*)data = available;
 
 			return B_OK;
 		}

src/kits/network/socket.cpp

@@ -315,9 +315,10 @@ getsockopt(int socket, int level, int option, void *value, socklen_t *_length)
 {
 	if (check_r5_compatibility()) {
 		if (option == R5_SO_FIONREAD) {
-			// there is no SO_FIONREAD in our stack; we're using FIONREAD instead
+			// there is no SO_FIONREAD in our stack; we're using FIONREAD
+			// instead
 			*_length = sizeof(int);
-			return ioctl(socket, FIONREAD, &value);
+			return ioctl(socket, FIONREAD, value);
 		}
 
 		convert_from_r5_sockopt(level, option);

src/libs/edit/read.c

@@ -419,7 +419,7 @@ el_gets(EditLine *el, int *nread)
 
 #ifdef FIONREAD
 	if (el->el_tty.t_mode == EX_IO && ma->level < 0) {
-		long chrs = 0;
+		int chrs = 0;
 
 		(void) ioctl(el->el_infd, FIONREAD, (ioctl_t) & chrs);
 		if (chrs == 0) {