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/test/test-time.c

@@ -220,7 +220,7 @@ int main(int argc, char *argv[]) {
 
         /* Ensure TIME_T_MAX works correctly */
         x = (uintmax_t) TIME_T_MAX;
-        x ++;
+        x++;
         assert((time_t) x < 0);
 
         return 0;