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/dhcp-option.c

@@ -34,7 +34,7 @@ static int option_append(uint8_t options[], size_t size, size_t *offset,
 
         if (code != SD_DHCP_OPTION_END)
                 /* always make sure there is space for an END option */
-                size --;
+                size--;
 
         switch (code) {
 

src/libsystemd-network/dhcp-packet.c

@@ -66,7 +66,7 @@ uint16_t dhcp_packet_checksum(uint8_t *buf, size_t len) {
                         /* wrap around in one's complement */
                         sum++;
 
-                buf_64 ++;
+                buf_64++;
         }
 
         if (len % sizeof(uint64_t)) {

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;