Fix for the "crash --osrelease" option for flattened format dumpfiles

in the unlikely event that the dumpfile header does not contain the
VMCOREINFO note section from the original ELF /proc/vmcore.  Without
the patch, the command displays nothing instead of showing "unknown".
(anderson@redhat.com)

makedumpfile.c

@@ -389,5 +389,5 @@ flattened_format_get_osrelease(char *file)
 		}
 	}
 
-	fclose(fp);
+	fclose(pipe);
 }