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, 3 insertions, 3 deletions

diff --git a/src/journal/test-mmap-cache.c b/src/journal/test-mmap-cache.c
index 7d03bfe9d1..b7bb260fcf 100644
--- a/src/journal/test-mmap-cache.c
+++ b/src/journal/test-mmap-cache.c
@@ -72,9 +72,9 @@ int main(int argc, char *argv[]) {
 
         mmap_cache_unref(m);
 
-        close_nointr_nofail(x);
-        close_nointr_nofail(y);
-        close_nointr_nofail(z);
+        safe_close(x);
+        safe_close(y);
+        safe_close(z);
 
         return 0;
 }