Remove additional space from comment.

src/t_stream.c

@@ -1220,7 +1220,7 @@ void xaddCommand(client *c) {
         return;
     }
 
-    /* Return ASAP if minimal ID  (0-0) was given so we avoid possibly creating
+    /* Return ASAP if minimal ID (0-0) was given so we avoid possibly creating
      * a new stream and have streamAppendItem fail, leaving an empty key in the
      * database. */
     if (id_given && id.ms == 0 && id.seq == 0) {