qa/new-grind: fixups

- syntax error left behind in previous commit
- if $PCPQA_VALGRIND=both, run both the non-valgrind and the
  valgrind variants, even if valgrind is installed

The second change has NOT been retrofitted to older valgrind test
pairs, but is in the new 1912/1913 (in the next commit).

qa/new-grind

@@ -158,9 +158,10 @@ NF == 1 && $1 == "#" && done == 0	{
 			{ print }
 /^  *do_valgrind=true/	{ print "elif which valgrind >/dev/null 2>&1"
 			  print "then"
-			  print "    _notrun \"valgrind variant qa/'$newseq' will be run\""
+			  print "    [ $PCPQA_VALGRIND = both ] || \\"
+			  print "        _notrun \"valgrind variant qa/'$newseq' will be run\""
 			  next
-			}
+			}'
     mv $oldseq.new-grind $oldseq
     chmod 755 $oldseq
 fi