Add missing file descriptor closes

Change-Id: I7154a022833a5e092facd7c5df776719b9fcc929
diff --git a/partition.cpp b/partition.cpp
index bbee37d..4644388 100644
--- a/partition.cpp
+++ b/partition.cpp
@@ -2906,6 +2906,7 @@
 		}
 	}
 exit:
+	close(fd);
 	return ret;
 #else
 	LOGINFO("Decrypt_Adopted: no crypto support\n");