Fix decimate filter for testing on VxWorks

Also adds checks to all filter tests to abort if they
can't continue because their filter wasn't registered.

modules/database/test/std/filters/arrTest.cpp

@@ -321,7 +321,10 @@ MAIN(arrTest)
 
     evtctx = db_init_events();
 
-    testOk(!!(plug = dbFindFilter(arr, strlen(arr))), "plugin arr registered correctly");
+    plug = dbFindFilter(arr, strlen(arr));
+    if (!plug)
+        testAbort("plugin '%s' not registered", arr);
+    testPass("plugin '%s' registered correctly", arr);
 
     check(DBR_LONG);
     check(DBR_DOUBLE);

modules/database/test/std/filters/decTest.c

@@ -145,8 +145,10 @@ MAIN(decTest)
 
     evtctx = db_init_events();
 
-    testOk(!!(plug = dbFindFilter(myname, strlen(myname))),
-        "plugin '%s' registered correctly", myname);
+    plug = dbFindFilter(myname, strlen(myname));
+    if (!plug)
+        testAbort("Plugin '%s' not registered", myname);
+    testPass("plugin '%s' registered correctly", myname);
 
     /* N < 1 */
     testOk(!(pch = dbChannelCreate("x.VAL{dec:{n:-1}}")),

modules/database/test/std/filters/syncTest.c

@@ -223,6 +223,8 @@ MAIN(syncTest)
 
     testOk(!!(plug = dbFindFilter(myname, strlen(myname))), "plugin %s registered correctly", myname);
     testOk(!!(red = dbStateCreate("red")), "state 'red' created successfully");
+    if (!plug || !red)
+        testAbort("Can't continue given above failure(s)");
 
     /* nonexisting state */
     testOk(!(pch = dbChannelCreate("x.VAL{sync:{m:'while',s:'blue'}}")),

modules/database/test/std/filters/tsTest.c

@@ -72,7 +72,10 @@ MAIN(tsTest)
 
     evtctx = db_init_events();
 
-    testOk(!!(plug = dbFindFilter(ts, strlen(ts))), "plugin ts registered correctly");
+    plug = dbFindFilter(ts, strlen(ts));
+    if (!plug)
+        testAbort("plugin '%s' not registered", ts);
+    testPass("plugin '%s' registered correctly", ts);
 
     testOk(!!(pch = dbChannelCreate("x.VAL{ts:{}}")), "dbChannel with plugin ts created");
     testOk((ellCount(&pch->filters) == 1), "channel has one plugin");