trace-cmd report: Fix pointer check in option -r

The removal of malloc_or_die() cause a bad check for allocation failure for
the option of '-r'.

Fixes: b57a3336be81 ("trace-cmd: Remove malloc_or_die() form trace-read.c")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 file changed