Mass rename of SCNO_IN_RANGE define to SCNO_IS_VALID

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/defs.h b/defs.h
index 1cc5d0f..f641e0d 100644
--- a/defs.h
+++ b/defs.h
@@ -753,5 +753,5 @@
 extern const char *const *signalent;
 extern unsigned nsignals;
 
-#define SCNO_IN_RANGE(scno) \
+#define SCNO_IS_VALID(scno) \
   ((unsigned long)(scno) < nsyscalls && sysent[scno].sys_func)