Fix %transfiletriggerpostun execution over multiple prefixes

Since its introduction, %transfiletriggerpostun has only executed
matches on the first prefix of a trigger due to a missing inner
loop on the intel gathering stage. This is pronouncedly different
from the other trigger types where the loop does take place as a
part of calling matchFilesNext() repeatedly. I think...

Fixes: rpm-software-management#3048

lib/rpmtriggers.c

@@ -120,11 +120,12 @@ static void addTriggers(rpmts ts, Header trigH, rpmsenseFlags filter,
     rpmTagVal prioTag = RPMTAG_TRANSFILETRIGGERPRIORITIES;
 
     while ((ds = rpmdsFilterTi(triggers, tix))) {
-	if ((rpmdsNext(ds) >= 0) && (rpmdsFlags(ds) & filter) &&
-		strcmp(prefix, rpmdsN(ds)) == 0) {
-	    unsigned int priority = getTrigPriority(trigH, prioTag, tix);
-	    rpmtriggersAdd(ts->trigs2run, headerGetInstance(trigH),
-				tix, priority);
+	while (rpmdsNext(ds) >= 0) {
+	    if ((rpmdsFlags(ds) & filter) && strcmp(prefix, rpmdsN(ds)) == 0) {
+		unsigned int priority = getTrigPriority(trigH, prioTag, tix);
+		rpmtriggersAdd(ts->trigs2run, headerGetInstance(trigH),
+				    tix, priority);
+	    }
 	}
 	rpmdsFree(ds);
 	tix++;