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/udev/net/link-config.c b/src/udev/net/link-config.c
index d3f1affffe..62439c0c71 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -127,8 +127,7 @@ void link_config_ctx_free(link_config_ctx *ctx) {
         if (!ctx)
                 return;
 
-        if (ctx->ethtool_fd >= 0)
-                close_nointr_nofail(ctx->ethtool_fd);
+        safe_close(ctx->ethtool_fd);
 
         sd_rtnl_unref(ctx->rtnl);