gdb: add some const in gdb/reggroups.c

This commit makes the 'struct reggroup *' argument const for the
following functions:

  reggroup_next
  reggroup_prev
  reggroup_name
  reggroup_type

There are other places that could benefit from const in the
reggroup.{c,h} files, but these will be changing in further commits.

There should be no user visible changes after this commit.

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/reggroups.h b/gdb/reggroups.h
index f2e60c4..ef99483 100644
--- a/gdb/reggroups.h
+++ b/gdb/reggroups.h
@@ -50,17 +50,17 @@ extern struct reggroup *reggroup_gdbarch_new (struct gdbarch *gdbarch,
 extern void reggroup_add (struct gdbarch *gdbarch, struct reggroup *group);
 
 /* Register group attributes.  */
-extern const char *reggroup_name (struct reggroup *reggroup);
-extern enum reggroup_type reggroup_type (struct reggroup *reggroup);
+extern const char *reggroup_name (const struct reggroup *reggroup);
+extern enum reggroup_type reggroup_type (const struct reggroup *reggroup);
 
 /* Iterators for the architecture's register groups.  Pass in NULL, returns
    the first (for next), or last (for prev) group.  Pass in a group,
    returns the next or previous group, or NULL when either the end or the
    beginning of the group list is reached.  */
 extern struct reggroup *reggroup_next (struct gdbarch *gdbarch,
-				       struct reggroup *last);
+				       const struct reggroup *last);
 extern struct reggroup *reggroup_prev (struct gdbarch *gdbarch,
-				       struct reggroup *curr);
+				       const struct reggroup *curr);
 /* Find a reggroup by name.  */
 extern reggroup *reggroup_find (struct gdbarch *gdbarch, const char *name);