selftests: proc: remove unreached code and fix build warning

fix the following warning:
proc-empty-vm.c:385:17: warning: ignoring return value of `write'
 declared with attribute `warn_unused_result' [-Wunused-result]
  385 |                 write(1, buf, rv);
      |                 ^~~~~~~~~~~~~~~~~

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Amer Al Shanawany <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Cc: Alexey Dobriyan <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Javier Carrasco <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Swarup Laxman Kotiaklapudi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Amer-shanawany

tools/testing/selftests/proc/proc-empty-vm.c

@@ -381,9 +381,6 @@ static int test_proc_pid_statm(pid_t pid)
 
 	assert(rv >= 0);
 	assert(rv <= sizeof(buf));
-	if (0) {
-		write(1, buf, rv);
-	}
 
 	const char *p = buf;
 	const char *const end = p + rv;