bug fix in stdio read instrumentation macro

darshan-runtime/lib/darshan-stdio.c

@@ -224,7 +224,7 @@ static void stdio_cleanup_runtime();
      rec_ref->file_rec->fcounters[STDIO_F_READ_START_TIMESTAMP] > __tm1) \
         rec_ref->file_rec->fcounters[STDIO_F_READ_START_TIMESTAMP] = __tm1; \
     rec_ref->file_rec->fcounters[STDIO_F_READ_END_TIMESTAMP] = __tm2; \
-    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[STDIO_F_READ_TIME], __tm1, __tm2, rec_ref->last_write_end); \
+    DARSHAN_TIMER_INC_NO_OVERLAP(rec_ref->file_rec->fcounters[STDIO_F_READ_TIME], __tm1, __tm2, rec_ref->last_read_end); \
 } while(0)
 
 #define STDIO_RECORD_WRITE(__fp, __bytes,  __tm1, __tm2, __fflush_flag) do{ \