Turn on warnings when building libap.

For ape, we never enabled warnings in cflags.
Turning it on brings up a lot of warnings. Most are noise,
but a few caught unused variables and trunctaions of pointers.
to smaller integers (int, long).

A few warnings remain.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/src/ape/lib/ap/plan9/read.c b/sys/src/ape/lib/ap/plan9/read.c
index 435a6d7f2..e4526905d 100644
--- a/sys/src/ape/lib/ap/plan9/read.c
+++ b/sys/src/ape/lib/ap/plan9/read.c
@@ -12,7 +12,7 @@ read(int d, void *buf, size_t nbytes)
 	int n, noblock, isbuf;
 	Fdinfo *f;
 
-	if(d<0 || d>=OPEN_MAX || !((f = &_fdinfo[d])->flags&FD_ISOPEN)){
+	if(d<0 || d>=OPEN_MAX || !(_fdinfo[d].flags & FD_ISOPEN)){
 		errno = EBADF;
 		return -1;
 	}