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/nspawn/nspawn-network.c

@@ -232,7 +232,7 @@ int setup_veth_extra(
                 if (r < 0)
                         return r;
 
-                idx ++;
+                idx++;
         }
 
         return 0;

src/nspawn/nspawn.c

@@ -2560,7 +2560,7 @@ static int inner_child(
 
         envp[n_env] = strv_find_prefix(environ, "TERM=");
         if (envp[n_env])
-                n_env ++;
+                n_env++;
 
         if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
             (asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||