tree-wide: make ++/-- usage consistent WRT spacing

Throughout the tree there's spurious use of spaces separating ++ and --
operators from their respective operands.  Make ++ and -- operator
consistent with the majority of existing uses; discard the spaces.

src/libsystemd-network/network-internal.c

@@ -375,7 +375,7 @@ int deserialize_in_addrs(struct in_addr **ret, const char *string) {
                 if (r <= 0)
                         continue;
 
-                size ++;
+                size++;
         }
 
         *ret = addresses;