apps/examples/bridge: Add host-side test driver

configs/sama5d3-xplained/bridge/defconfig

@@ -813,6 +813,7 @@ CONFIG_EXAMPLES_BRIDGE_NET1_MACADDR=0x00e0deadbeef
 CONFIG_EXAMPLES_BRIDGE_NET1_IPADDR=0x0a000002
 CONFIG_EXAMPLES_BRIDGE_NET1_DRIPADDR=0x0a000001
 CONFIG_EXAMPLES_BRIDGE_NET1_NETMASK=0xffffff00
+CONFIG_EXAMPLES_BRIDGE_NET1_IPHOST=0x0a000001
 CONFIG_EXAMPLES_BRIDGE_NET1_STACKSIZE=2048
 CONFIG_EXAMPLES_BRIDGE_NET1_PRIORITY=100
 
@@ -829,6 +830,7 @@ CONFIG_EXAMPLES_BRIDGE_NET2_MACADDR=0x00e0f00dface
 CONFIG_EXAMPLES_BRIDGE_NET2_IPADDR=0x0a000003
 CONFIG_EXAMPLES_BRIDGE_NET2_DRIPADDR=0x0a000001
 CONFIG_EXAMPLES_BRIDGE_NET2_NETMASK=0xffffff00
+CONFIG_EXAMPLES_BRIDGE_NET2_IPHOST=0x0a000001
 CONFIG_EXAMPLES_BRIDGE_NET2_STACKSIZE=2048
 CONFIG_EXAMPLES_BRIDGE_NET2_PRIORITY=100
 # CONFIG_EXAMPLES_BUTTONS is not set

fs/vfs/fs_poll.c

@@ -346,6 +346,8 @@ int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout)
                  }
                else
                  {
+                   /* EINTR is the only other error expected in normal operation */
+
                    ret = -err;
                  }
              }