Fix memleak reported by @zlowram

libr/core/cmd_open.c

@@ -1342,7 +1342,6 @@ static int cmd_open(void *data, const char *input) {
 		case 0:
 		case '?':
 			r_core_cmd_help (core, help_msg_o_);
-			eprintf ("Usage: o-#, o-! or o-*, where # is the filedescriptor number\n");
 		}
 		break;
 	case '.': // "o."

libr/core/file.c

@@ -911,6 +911,7 @@ R_API int r_core_file_close(RCore *r, RCoreFile *fh) {
 		}
 	}
 	r_io_desc_close (desc);
+	r_core_file_free (fh);
 	return ret;
 }