Fix warnings found by clang with new warning flags to be added in later commit

Fixes consist in:
- no use of comma operator for multi statement purpose
- avoid confusing comma in for loops first and third clauses
- avoid implicit long to int casts by storing to long, or explicit bound checking before cast

1 files changed, 1 insertions, 1 deletions

diff --git a/src/projects.h b/src/projects.h
index d6d6e23e..5b923813 100644
--- a/src/projects.h
+++ b/src/projects.h
@@ -684,7 +684,7 @@ typedef struct _pj_gi {
     const char *format; /* format of this grid, ie "ctable", "ntv1",
                            "ntv2" or "missing". */
 
-    int   grid_offset;  /* offset in file, for delayed loading */
+    long   grid_offset;  /* offset in file, for delayed loading */
     int   must_swap;    /* only for NTv2 */
 
     struct CTABLE *ct;