jemalloc doesn't close /proc/sys/vm/overcommit_memory

Bug: 29881356
Bug: https://github.com/jemalloc/jemalloc/issues/399
Test: device boots again

(cherry picked from commit 54374abfaef24d7d74083f0d57b81d39db36ce5b)

Change-Id: Ia8cbd53eaa13d14f1742853fcf3066c96f7d9e45
diff --git a/src/pages.c b/src/pages.c
index 240d4ce..51d55f5 100644
--- a/src/pages.c
+++ b/src/pages.c
@@ -237,6 +237,7 @@
 		return (false); /* Error. */
 
 	nread = read(fd, &buf, sizeof(buf));
+	close(fd);
 	if (nread < 1)
 		return (false); /* Error. */
 	/*