lib: Fix reading from non-blocking flows

The -EAGAIN from a failed non-blocking flow read would trigger the
assertion. This snuck in somehow (we need some unit tests for dev.c).

1 files changed, 3 insertions, 4 deletions

diff --git a/src/lib/dev.c b/src/lib/dev.c
index c62fea40..eefb9b18 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -919,13 +919,12 @@ ssize_t flow_read(int fd, void * buf, size_t count)
                 pthread_rwlock_rdlock(&ai.data_lock);
         }
 
-        if (idx == -ETIMEDOUT) {
+        if (idx < 0) {
+                assert(idx == -EAGAIN || idx == -ETIMEDOUT);
                 pthread_rwlock_unlock(&ai.data_lock);
-                return -ETIMEDOUT;
+                return idx;
         }
 
-        assert(idx >= 0);
-
         n = shm_rdrbuff_read(&sdu, ai.rdrb, idx);
         if (n < 0) {
                 pthread_rwlock_unlock(&ai.data_lock);