coccinelle: make use of SYNTHETIC_ERRNO

Ideally, coccinelle would strip unnecessary braces too. But I do not see any
option in coccinelle for this, so instead, I edited the patch text using
search&replace to remove the braces. Unfortunately this is not fully automatic,
in particular it didn't deal well with if-else-if-else blocks and ifdefs, so
there is an increased likelikehood be some bugs in such spots.

I also removed part of the patch that coccinelle generated for udev, where we
returns -1 for failure. This should be fixed independently.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/login/logind-button.c b/src/login/logind-button.c
index 0defa6b9ba..7c9cf05dd7 100644
--- a/src/login/logind-button.c
+++ b/src/login/logind-button.c
@@ -329,10 +329,10 @@ int button_open(Button *b) {
         r = button_suitable(b);
         if (r < 0)
                 return log_warning_errno(r, "Failed to determine whether input device is relevant to us: %m");
-        if (r == 0) {
-                log_debug("Device %s does not expose keys or switches relevant to us, ignoring.", p);
-                return -EADDRNOTAVAIL;
-        }
+        if (r == 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EADDRNOTAVAIL),
+                                       "Device %s does not expose keys or switches relevant to us, ignoring.",
+                                       p);
 
         if (ioctl(b->fd, EVIOCGNAME(sizeof(name)), name) < 0) {
                 r = log_error_errno(errno, "Failed to get input name: %m");