trace-cmd: Making the "die" functions noreturn

This patch makes all the "die" functions in trace-cmd noreturn in order we to be
able to use them in negative code paths inside non-void functions, without
getting compiler warnings and, clearly, without work-arounds like non-sense
return statements after a die().

Link: http://lkml.kernel.org/r/20171123163335.19078-11-vladislav.valtchev@gmail.com

Signed-off-by: Vladislav Valtchev (VMware) <vladislav.valtchev@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
3 files changed