perf trace beauty fcntl: Augment the return of F_DUPFD(_CLOEXEC)

Using the existing 'fd' beautifier, now we can see the path for the just
dup'ed fd:

 18031.338 ( 0.009 ms): gnome-terminal/2472 fcntl(fd: 55, cmd: DUPFD_CLOEXEC) = 56</memfd:gdk-wayland (deleted)>

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-z0ggo126p2eobfwnjw9z16tw@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/trace/beauty/fcntl.c

@@ -30,6 +30,10 @@ size_t syscall_arg__scnprintf_fcntl_cmd(char *bf, size_t size, struct syscall_ar
 		syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fcntl_getfd);
 		goto mask_arg;
 	}
+	if (arg->val == F_DUPFD_CLOEXEC || arg->val == F_DUPFD) {
+		syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fd);
+		goto out;
+	}
 	/*
 	 * Some commands ignore the third fcntl argument, "arg", so mask it
 	 */
@@ -38,7 +42,7 @@ size_t syscall_arg__scnprintf_fcntl_cmd(char *bf, size_t size, struct syscall_ar
 mask_arg:
 		arg->mask |= (1 << 2);
 	}
-
+out:
 	return syscall_arg__scnprintf_strarrays(bf, size, arg);
 }