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	Use switch for fork() - sinit - suckless init
	git clone git://git.suckless.org/sinit
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	---
	commit 731f65fc82afcd474f4c682f9f0069e5c80c86dd
	parent 40a9fd323646b680a4eb046076c606339fd7501e
	Author: FRIGN <[email protected]>
	Date: Fri, 23 Sep 2016 09:37:59 +0200

	Use switch for fork()

	This saves us one local variable and 2 lines of code, while improving
	readability by using the switch-style we are used to from other suckless
	projects.

	We are allowed to check against -1, as POSIX clearly mandates for the
	RETURN VALUE:

	"Upon successful completion, fork() shall return 0 to the child process
	and shall return the process ID of the child process to the parent
	process. Both processes shall continue to execute from the fork()
	function. Otherwise, -1 shall be returned to the parent process, no
	child process shall be created, and errno shall be set to indicate the
	error."
	[http://pubs.opengroup.org/onlinepubs/9699919799/functions/fork.html]

	This way, checking against < 0 was overdoing it and it's sufficient to
	compare against -1, justifying the switch statement here.

	Diffstat:
	M sinit.c \| 10 ++++------

	1 file changed, 4 insertions(+), 6 deletions(-)
	---
	diff --git a/sinit.c b/sinit.c
	@@ -74,16 +74,14 @@ sigreboot(void)
	static void
	spawn(char *const argv[])
	{
	- pid_t pid;
	-
	- pid = fork();
	- if (pid < 0) {
	- perror("fork");
	- } else if (pid == 0) {
	+ switch (fork()) {
	+ case 0:
	sigprocmask(SIG_UNBLOCK, &set, NULL);
	setsid();
	execvp(argv[0], argv);
	perror("execvp");
	_exit(1);
	+ case -1:
	+ perror("fork");
	}
	}