[PULL 24/29] migration: remove unreachable code after reading data

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: Daniel P. Berrangé <berrange@redhat.com>

The code calls qio_channel_read() in a loop when it reports
QIO_CHANNEL_ERR_BLOCK. This code is reported when errno==EAGAIN.

As such the later block of code will always hit the 'errno != EAGAIN'
condition, making the final 'else' unreachable.

Fixes: Coverity CID 1490203
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220627135318.156121-1-berrange@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/qemu-file.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 2f266b25cd..4f400c2e52 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -411,10 +411,8 @@ static ssize_t qemu_fill_buffer(QEMUFile *f)
         f->total_transferred += len;
     } else if (len == 0) {
         qemu_file_set_error_obj(f, -EIO, local_error);
-    } else if (len != -EAGAIN) {
-        qemu_file_set_error_obj(f, len, local_error);
     } else {
-        error_free(local_error);
+        qemu_file_set_error_obj(f, len, local_error);
     }
 
     return len;
-- 
2.36.1