Small tidy up.

Author: aardvark179

src/main/c/truffleposix/truffleposix.c

@@ -111,13 +111,13 @@ static void mark_ready_from_set(fd_set *set, int nfds, int *fds) {
   }
 }
 
-int truffleposix_poll(int fd, int events, int timeout) {
+int truffleposix_poll(int fd, int events, int timeout_ms) {
   struct pollfd fds;
 
   fds.fd = fd;
   fds.events = events;
 
-  return poll(&fds, 1, timeout);
+  return poll(&fds, 1, timeout_ms);
 }
 
 int truffleposix_select(int nread, int *readfds, int nwrite, int *writefds,

src/main/ruby/truffleruby/core/posix.rb

@@ -214,7 +214,6 @@ def self.attach_function_eagerly(native_name, argument_types, return_type,
   attach_function :open, [:string, :int, varargs(:mode_t)], :int
   attach_function :opendir, [:string], :pointer
   attach_function :pipe, [:pointer], :int
-  attach_function :poll, [:pointer, :long, :int], :int, LIBC, true
   attach_function :truffleposix_poll, [:pointer, :long, :int], :int, LIBTRUFFLEPOSIX, true
   attach_function :read, [:int, :pointer, :size_t], :ssize_t, LIBC, true
   attach_function :readlink, [:string, :pointer, :size_t], :ssize_t

src/main/ruby/truffleruby/core/truffle/io_operations.rb

@@ -211,7 +211,7 @@ def self.poll(io, event_mask, timeout)
 
         raise ArgumentError, 'timeout must be positive' if timeout < 0
 
-        # Microseconds, rounded down
+        # Milliseconds, rounded down
         timeout = remaining_timeout = (timeout * 1_000).to_i
         start = Process.clock_gettime(Process::CLOCK_MONOTONIC, :millisecond)
         deadline = start + timeout