tests/valgrind.pm: suppress memleaks of NSS_InitContext()

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=745224

tests/valgrind.pm

@@ -36,6 +36,7 @@ sub valgrindparse {
     my @o;
 
     my $bt=0;
+    my $nssinit=0;
 
     open(VAL, "<$file");
     while(<VAL>) {
@@ -53,9 +54,14 @@ sub valgrindparse {
                         $us++;
                     } #else {print "Not our source: $func, $source, $line\n";}
                 }
+
+                # the memory leakage within NSS_InitContext is not a bug of curl
+                if($w =~ /NSS_InitContext/) {
+                    $nssinit++;
+                }
             }
             else {
-                if($us) {
+                if($us and not $nssinit) {
                     # the stack trace included source details about us
 
                     $error++;
@@ -71,6 +77,7 @@ sub valgrindparse {
                 }
                 $bt = 0; # no more backtrace
                 $us = 0;
+                $nssinit = 0;
             }
         }
         else {