trace-read: do not modify timestamps in ftrace events

We're about to allow multiple files to be loaded and we need to have a
common time base for all files. Relative timestamps local to a file
won't work.

src/gpuvis_ftrace_print.cpp

@@ -295,7 +295,7 @@ void TraceEvents::new_event_ftrace_print( trace_event_t &event )
 
     if ( bufvar == bufvar_ltime )
     {
-        event.ts = atoll( var_ltime ) - m_trace_info.min_file_ts;
+        event.ts = atoll( var_ltime );
 
         // Remove "ltime=XXX", etc from buf
         buf = trim_ftrace_print_buf( newbuf, buf, var_ltime, s_buf_vars[ bufvar ].len );

src/trace-cmd/trace-read.cpp

@@ -1648,7 +1648,7 @@ static int trace_enum_events( trace_data_t &trace_data, tracecmd_input_t *handle
 
         trace_event.pid = pid;
         trace_event.cpu = record->cpu;
-        trace_event.ts = record->ts - trace_data.trace_info.min_file_ts;
+        trace_event.ts = record->ts;
 
         trace_event.comm = strpool.getstrf( "%s-%u", comm, pid );