Mass rename of SCNO_IN_RANGE define to SCNO_IS_VALID

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/pathtrace.c b/pathtrace.c
index 12e47e9..1a7d1db 100644
--- a/pathtrace.c
+++ b/pathtrace.c
@@ -162,7 +162,7 @@
 	if (selected[0] == NULL)
 		return 1;
 
-	if (!SCNO_IN_RANGE(tcp->scno))
+	if (!SCNO_IS_VALID(tcp->scno))
 		return 0;
 
 	s = &sysent[tcp->scno];