Mark aproc as done prior to calling callback

Author: hovsater

aproc.c

@@ -114,9 +114,9 @@ int aproc_drain_all(aproc_t *aprocs, int *ttyfd) {
             // Read and invoke callback
             if (FD_ISSET(aproc->rfd, &readfds)) {
                 nbytes = read(aproc->rfd, &buf, 1024);
+                if (nbytes == 0) aproc->is_done = 1;
                 buf[nbytes] = '\0';
                 aproc->callback(aproc, buf, nbytes);
-                if (nbytes == 0) aproc->is_done = 1;
             }
             // Destroy on eof.
             // Not sure if ferror and feof have any effect here given we're not