liblog: add __android_log_close()

Bug: 30963384

(cherry picked from commit df7a4c6bae5f85532d79a93b7d9197a2aab17825)

Change-Id: Ide70df3c04e29301649a1ca234b1b0af687bcbfb
(cherry picked from commit b1b5d507cba4b37221016d308dbf9fdd39019108)
diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index 64492f2..667fdb3 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -355,6 +355,9 @@
 #else
     close(logd_fd);
     logd_fd = -1;
+
+    close(pstore_fd);
+    pstore_fd = -1;
 #endif
 
 #ifdef HAVE_PTHREADS