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/basic/io-util.c

@@ -249,7 +249,7 @@ ssize_t sparse_write(int fd, const void *p, size_t sz, size_t run_length) {
                 } else if (n > 0)
                         q += n;
                 else
-                        q ++;
+                        q++;
         }
 
         if (q > w) {