testsuite: Fix scan-lang-dump-not

[Nathan Sidwell]

pushed as obvious

turned out scan-lang-dump-not was broken in the 3 argument case -- I'd 
missed a necessary empty arg.  Fixed thusly.

            gcc/testsuite/
            * lib/scanlang.exp (scan-lang-dump-not): Fix 3-arg case.

--
Nathan Sidwell
diff --git c/gcc/testsuite/lib/scanlang.exp w/gcc/testsuite/lib/scanlang.exp
index 2f80f65f569..d9f8c1e6e83 100644
--- c/gcc/testsuite/lib/scanlang.exp
+++ w/gcc/testsuite/lib/scanlang.exp
@@ -36,10 +36,11 @@ proc scan-lang-dump { args } {
 	return
     }
     if { [llength $args] >= 3 } {
-	scan-dump "lang" [lindex $args 0] \
-		  "\[0-9\]\[0-9\]\[0-9\]l.[lindex $args 1]" "" [lindex $args 2]
+	scan-dump-not "lang" [lindex $args 0] \
+	    "\[0-9\]\[0-9\]\[0-9\]l.[lindex $args 1]" "" \
+	    [lindex $args 2]
     } else {
-	scan-dump "lang" [lindex $args 0] \
-		  "\[0-9\]\[0-9\]\[0-9\]l.[lindex $args 1]" ""
+	scan-dump-not "lang" [lindex $args 0] \
+	    "\[0-9\]\[0-9\]\[0-9\]l.[lindex $args 1]"
     }
 }