neato_layout: [nfc] squash a -Wsign-conversion warning

`Pack` is known non-negative in this branch.

diff --git a/lib/neatogen/neatoinit.c b/lib/neatogen/neatoinit.c
index a7168df23eb55ab555683a90253c6e7ebbc0772c..bf1f28da310f4593a260f2377abd6b6c63e78ded 100644 (file)
--- a/lib/neatogen/neatoinit.c
+++ b/lib/neatogen/neatoinit.c
@@ -1468,7 +1468,7 @@ void neato_layout(Agraph_t * g)
                    bp[0] = TRUE;
                } else
                    bp = 0;
-               pinfo.margin = Pack;
+               pinfo.margin = (unsigned)Pack;
                pinfo.fixed = bp;
                pinfo.doSplines = 1;
                packGraphs(n_cc, cc, g, &pinfo);