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.

src/basic/log.h

@@ -202,10 +202,10 @@ void log_assert_failed_return_realm(
 #define log_full_errno_realm(realm, level, error, ...)                  \
         ({                                                              \
                 int _level = (level), _e = (error), _realm = (realm);   \
-                (log_get_max_level_realm(_realm) >= LOG_PRI(_level))   \
+                (log_get_max_level_realm(_realm) >= LOG_PRI(_level))    \
                         ? log_internal_realm(LOG_REALM_PLUS_LEVEL(_realm, _level), _e, \
                                              __FILE__, __LINE__, __func__, __VA_ARGS__) \
-                        : -abs(_e);                                     \
+                        : -ERRNO_VALUE(_e);                             \
         })
 
 #define log_full_errno(level, error, ...)                               \