core dump on finding a record in the callback of writing

[tangthth]

Issue Description:

Core dump occurs when finding a record in the callback of writing. The script aborted and core dump file generated, but no any error message reported.

Reproduce Step:

1. write a nodejs script as below to write a record and in its callback find the record
2. execute the script

Logs:

/u/usra/myscripts:>node test_vsam.js
Writing record done. Record key: 00001
/u/usra/myscripts:>ls -l
total 635968
-rw------- 1 USRA GRPA 162689280 Aug 23 10:00 coredump.01010453
-rw-r----- 1 USRA GRPA 192 Aug 10 06:37 schema.json
-rw-r----- 1 USRA GRPA 8286 Aug 23 10:00 test_vsam.js
/u/usra/myscripts:>file coredump.01010453
coredump.01010453: binary data
/u/tangth/myscripts:>file -i coredump.01010453
coredump.01010453: regular file

Reference:

vsamObj.write(recordx, function(err) {
	if (err !=null)	{
		console.log("Error in writing Record.  Record Key: " + recordx.key)
		console.error("The Error is: " + err)
	}
    else {
		console.log("Writing record done.  Record key: " + recordx.key)
				
		vsamObj.find(recordx.key, function(record,err) {		    
			console.log("Entering the callback of vsamObj.find().")
			if (err != null ) {
				console.log("Error in finding the record by key: " + recordx.key)
				console.error("The Error is: " + err)
			}	
			else {
				console.log("Found record key: " + record.key + ", record name: " + record.name + ", record gender: " + record.gender)		
			}				
		})
	}
})