libc: fix fstatfs() implementation.

The syscall expects the size of the buffer as the second argument.

Change-Id: I99ede2fec7fcd385ca03ff022c2cffa4297bea8d
diff --git a/libc/docs/CHANGES.TXT b/libc/docs/CHANGES.TXT
index 9389f7a..cbca6cb 100644
--- a/libc/docs/CHANGES.TXT
+++ b/libc/docs/CHANGES.TXT
@@ -63,6 +63,8 @@
 
 - <sys/select.h>: add missing declaration for pselect()
 
+- <sys/vfs.h>: fixed implementation of fstatfs() (also fixes fpathconf()
+  which uses it).
 
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 Differences between Android 2.2. and Android 2.1: