fix for double free in efi.c

@@ -546,8 +547,8 @@
 
 		*gpt = pgpt;
 		*ptes = pptes;
-		if (agpt)  kfree(agpt);
-		if (aptes) kfree(aptes);
+		if (agpt)   { kfree(agpt); agpt=NULL; }
+		if (aptes)  { kfree(aptes); aptes=NULL; }
 	} /* if primary is valid */
 	else {
 		/* Primary GPT is bad, check the Alternate GPT */

@@ -595,6 +596,8 @@
         if (agpt) {kfree(agpt); agpt = NULL;}
         if (pptes) {kfree(pptes); pptes = NULL;}
         if (aptes) {kfree(aptes); aptes = NULL;}
+        *gpt = NULL;
+        *ptes = NULL;
 	return 0;
 }