If some of the file system operations failed, System.gc() was called in a loop.…

If some of the file system operations failed, System.gc() was called in a loop. Now it is called once at most.

h2/src/main/org/h2/store/fs/FileSystemDisk.java

@@ -107,7 +107,7 @@ public class FileSystemDisk extends FileSystem {
     }
 
     private static void wait(int i) {
-        if (i > 8) {
+        if (i == 8) {
             System.gc();
         }
         try {