warnless.h: Removed spurious character from commit 696bc6b9c9

Not picked up by checksrc or Visual Studio but my own code review, this
would haven broken Intel based Unix builds - Perhaps I should learn to
type on my laptop's keyboard before committing!

lib/warnless.h

@@ -88,7 +88,7 @@ ssize_t curlx_write(int fd, const void *buf, size_t count);
 int curlx_FD_ISSET(int fd, fd_set *fdset);
 
 void curlx_FD_SET(int fd, fd_set *fdset);
-3
+
 void curlx_FD_ZERO(fd_set *fdset);
 
 unsigned short curlx_htons(unsigned short usnum);