{ps,nl}solve: constify exported colloc grid

Reduces compiler warnings.

1 files changed, 1 insertions, 1 deletions

diff --git a/pssolve.h b/pssolve.h
index b350a1a..15ee313 100644
--- a/pssolve.h
+++ b/pssolve.h
@@ -116,7 +116,7 @@ typedef struct PSSolveContext {
      *
      * Set by the solver after tdi_pssolve_context_init().
      */
-    double *(*colloc_grid)[2];
+    const double * const (*colloc_grid)[2];
 
     /**
      * The thread pool used for multithreaded execution. May be set by the