[ps] Need better error handling when lp not defined

bug=102276 r=Roland.Mainz@informatik.med.uni-giessen.de sr=bzbarsky

gfx/src/ps/nsDeviceContextPS.cpp

@@ -373,12 +373,12 @@ NS_IMETHODIMP nsDeviceContextPS::EndDocument(void)
   NS_ENSURE_TRUE(mPSObj != nsnull, NS_ERROR_NULL_POINTER);
   
   /* Finish the document and print it... */  
-  mPSObj->end_document();
+  nsresult rv = mPSObj->end_document();
 
   delete mPSObj;
   mPSObj = nsnull;
 
-  return NS_OK;
+  return rv;
 }
 
 /** ---------------------------------------------------

gfx/src/ps/nsPostScriptObj.cpp

@@ -60,6 +60,7 @@
 #include "prenv.h"
 
 #include <locale.h>
+#include <errno.h>
 
 #ifdef VMS
 #include <stdlib.h>
@@ -2120,6 +2121,9 @@ nsPostScriptObj::end_document()
 
     pclose(pipe);
     PR_LOG(nsPostScriptObjLM, PR_LOG_DEBUG, ("piping done, copied %ld bytes.\n", job_size));
+    if (errno != 0) {
+      return NS_ERROR_GFX_PRINTER_CMD_FAILURE;
+    }
   }
   
   return NS_OK;