Fix errors reported by Coverity

Thanks to Jiri Popelka from Red Hat for sending the output of a
Coverity run over qpdf.

libqpdf/QPDFObjectHandle.cc

@@ -35,6 +35,7 @@ QPDFObjectHandle::ParserCallbacks::terminateParsing()
 
 QPDFObjectHandle::QPDFObjectHandle() :
     initialized(false),
+    qpdf(0),
     objid(0),
     generation(0),
     reserved(false)

libqpdf/QPDFWriter.cc

@@ -70,6 +70,7 @@ QPDFWriter::init()
     encryption_V = 0;
     encryption_R = 0;
     encryption_dict_objid = 0;
+    pipeline = 0;
     next_objid = 1;
     cur_stream_length_id = 0;
     cur_stream_length = 0;
@@ -2695,7 +2696,7 @@ QPDFWriter::writeLinearized()
 
     this->next_objid = part4_first_obj;
     enqueuePart(part4);
-    assert(this->next_objid = after_part4);
+    assert(this->next_objid == after_part4);
     this->next_objid = part6_first_obj;
     enqueuePart(part6);
     assert(this->next_objid == after_part6);

libtests/flate.cc

@@ -46,6 +46,7 @@ void run(char const* filename)
 	// Write to the both pipeline
 	def3->write(buf, len);
     }
+    fclose(in1);
 
     def1->finish();
     delete def1;
@@ -69,6 +70,7 @@ void run(char const* filename)
     {
 	inf2->write(buf, len);
     }
+    fclose(in2);
 
     inf2->finish();
     delete inf2;