fixed compilation error

src/DnaSeqStr.h

@@ -32,7 +32,7 @@ public :
 
 public:
     DnaSeqStr():fq_record_buf(new char[MAX_FQ_RECORD_LENGTH]) {
-	cout<<"Calling DnaSeqStr constructor"<<endl;
+	    cout<<"Calling DnaSeqStr constructor"<<endl;
     	length=0;
     	start_idx=0;
     }
@@ -44,8 +44,8 @@ public:
     }
 
     ~DnaSeqStr() {
-	cout<<"Calling DnaSeqStr destructor"<<endl;
-    	delete fq_record_buf[];
+	    cout<<"Calling DnaSeqStr destructor"<<endl;
+    	delete[] fq_record_buf;
     }
 };