internal/poll: correct function name in comment

Change-Id: I3b28a45e942a6d6032855758fcc41e4edd64aa32
GitHub-Last-Rev: 9c994bbee7420861b5dc83e71e50fc43d7f6650b
GitHub-Pull-Request: golang/go#39467
Reviewed-on: https://go-review.googlesource.com/c/go/+/237059
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/internal/poll/fd_unix.go b/src/internal/poll/fd_unix.go
index 85c79bb..4872fa9 100644
--- a/src/internal/poll/fd_unix.go
+++ b/src/internal/poll/fd_unix.go
@@ -479,7 +479,7 @@
 	return dupCloseOnExecOld(fd)
 }
 
-// dupCloseOnExecUnixOld is the traditional way to dup an fd and
+// dupCloseOnExecOld is the traditional way to dup an fd and
 // set its O_CLOEXEC bit, using two system calls.
 func dupCloseOnExecOld(fd int) (int, string, error) {
 	syscall.ForkLock.RLock()