BUG #21858 Make sure retry when EINTR returns, which decreases memory leak chance.

storage/ndb/src/common/util/File.cpp:
  Avoid memory leak when EINTR error returns. Even though a close error happens, a ERROR message in out-file is given, and this shouldn't affect the normally running.

storage/ndb/src/common/util/File.cpp

@@ -123,12 +123,24 @@ bool
 File_class::close()
 {
   bool rc = true;
+  int retval = 0;
+
   if (m_file != NULL)
   { 
     ::fflush(m_file);
-    rc = (::fclose(m_file) == 0 ? true : false);
-    m_file = NULL; // Try again?
+    retval = ::fclose(m_file);
+    while ( (retval != 0) && (errno == EINTR) ){
+      retval = ::fclose(m_file);
+    }
+    if( retval == 0){
+      rc = true;
+    }
+    else {
+      rc = false;
+      ndbout_c("ERROR: Close file error in File.cpp for %s",strerror(errno));
+    }   
   }  
+  m_file = NULL;
   
   return rc;
 }