Un-boolify sbase

It actually makes the binaries smaller, the code easier to read
(gems like "val == true", "val == false" are gone) and actually
predictable in the sense of that we actually know what we're
working with (one bitwise operator was quite adventurous and
should now be fixed).

This is also more consistent with the other suckless projects
around which don't use boolean types.

renice.c

@@ -1,17 +1,16 @@
 /* See LICENSE file for copyright and license details. */
-#include <sys/resource.h>
 #include <errno.h>
 #include <limits.h>
 #include <pwd.h>
-#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/resource.h>
 
 #include "util.h"
 
 static int strtop(const char *);
-static bool renice(int, int, long);
+static int renice(int, int, long);
 
 static void
 usage(void)
@@ -95,7 +94,7 @@ strtop(const char *s)
 	return (int)n;
 }
 
-static bool
+static int
 renice(int which, int who, long adj)
 {
 	errno = 0;
@@ -103,15 +102,15 @@ renice(int which, int who, long adj)
 	if (errno != 0) {
 		fprintf(stderr, "can't get %d nice level: %s\n",
 		        who, strerror(errno));
-		return false;
+		return 0;
 	}
 
 	adj = MAX(-NZERO, MIN(adj, NZERO - 1));
 	if (setpriority(which, who, (int)adj) == -1) {
 		fprintf(stderr, "can't set %d nice level: %s\n",
 		        who, strerror(errno));
-		return false;
+		return 0;
 	}
 
-	return true;
+	return 1;
 }