When we have less than blocksize data left we MUST (attempt to) read more

since we can't decrypt anything in that situation.

src/transport.c

@@ -267,7 +267,6 @@ libssh2_packet_read(LIBSSH2_SESSION * session)
     int numdecrypt;
     unsigned char block[MAX_BLOCKSIZE];
     int blocksize;
-    int minimum;
     int encrypted = 1;
 
     /*
@@ -293,7 +292,6 @@ libssh2_packet_read(LIBSSH2_SESSION * session)
             blocksize = 5;      /* not strictly true, but we can use 5 here to
                                    make the checks below work fine still */
         }
-        minimum = p->total_num ? p->total_num - p->data_num : blocksize;
 
         /* read/use a whole big chunk into a temporary area stored in
            the LIBSSH2_SESSION struct. We will decrypt data from that
@@ -308,8 +306,8 @@ libssh2_packet_read(LIBSSH2_SESSION * session)
         /* if remainbuf turns negative we have a bad internal error */
         assert(remainbuf >= 0);
 
-        if (remainbuf < minimum) {
-            /* If we have less than a minimum left, it is too
+        if (remainbuf < blocksize) {
+            /* If we have less than a blocksize left, it is too
                little data to deal with, read more */
             ssize_t nread;