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, 3 insertions, 4 deletions

diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index 3cdadc8fad..b6b15cf114 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -146,10 +146,9 @@ static int parse_argv(int argc, char *argv[]) {
                         assert_not_reached("Unhandled option");
                 }
 
-        if (arg_machine && arg_show_unit != SHOW_UNIT_NONE) {
-                log_error("Cannot combine --unit or --user-unit with --machine=.");
-                return -EINVAL;
-        }
+        if (arg_machine && arg_show_unit != SHOW_UNIT_NONE)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Cannot combine --unit or --user-unit with --machine=.");
 
         return 1;
 }