PortalTransforms: Fix typo in useStdin 'if' condition in subprocesstransform.

useStdin=False => temporary file was not created.
useStdin=True  => temporary file was created.

product/PortalTransforms/libtransforms/commandtransform.py

@@ -148,7 +148,7 @@ class subprocesstransform:
     def convert(self, data, cache, **kwargs):
         command = "%s %s" % (self.binary, self.binaryArgs)
 
-        if self.useStdin:
+        if not self.useStdin:
           tempfile_object = tempfile.NamedTemporaryFile()
           tmpname = tempfile_object.name
           tempfile_object.write( data)

product/PortalTransforms/transforms/pdf_to_text.py

@@ -23,7 +23,7 @@ class pdf_to_text(subprocesstransform):
 
     binaryName = "pdftotext"
     binaryArgs = "-enc UTF-8 -layout -nopgbrk %(infile)s -"
-    useStdin = True
+    useStdin = False
 
 class old_pdf_to_text(commandtransform):
     implements(ITransform)

product/PortalTransforms/transforms/tiff_to_text.py

@@ -20,6 +20,7 @@ class tiff_to_text(commandtransform):
 
     binaryName = "tesseract"
     binaryArgs = "%(infile)s "
+    useStdin = False
 
     def __init__(self):
         commandtransform.__init__(self, binary=self.binaryName)