util: replace close_nointr_nofail() by a more useful safe_close()

safe_close() automatically becomes a NOP when a negative fd is passed,
and returns -1 unconditionally. This makes it easy to write lines like
this:

        fd = safe_close(fd);

Which will close an fd if it is open, and reset the fd variable
correctly.

By making use of this new scheme we can drop a > 200 lines of code that
was required to test for non-negative fds or to reset the closed fd
variable afterwards.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/shared/watchdog.c b/src/shared/watchdog.c
index ddbe7afd3c..ba9ad9be97 100644
--- a/src/shared/watchdog.c
+++ b/src/shared/watchdog.c
@@ -164,6 +164,5 @@ void watchdog_close(bool disarm) {
                 }
         }
 
-        close_nointr_nofail(watchdog_fd);
-        watchdog_fd = -1;
+        watchdog_fd = safe_close(watchdog_fd);
 }