perf machine: Remove unused struct process_args

After commit a93f0e551af9 ("perf symbols: Get kernel start address by symbol
name"), no one uses struct process_args any more, so remove it.

Signed-off-by: Yuan Can <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/linux-perf-users/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/machine.c

···
 	return kernel;
 }
 
-struct process_args {
-	u64 start;
-};
-
 void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 				    size_t bufsz)
 {