[PATCH] maint: avoid discarded-qualifiers warnings with SELinux 3.5

[Bernhard Voelker]

Since SELinux version 3.5, the return value of context_str(3) is
declared as const; see:
  https://github.com/SELinuxProject/selinux/commit/dd98fa322766
Therefore, GCC complains (here with -Werror):
  src/selinux.c: In function 'defaultcon':
  src/selinux.c:152:16: error: assignment discards 'const' qualifier \
    from pointer target type [-Werror=discarded-qualifiers]
    152 |   if (!(constr = context_str (tcontext)))
        |                ^
  src/selinux.c: In function 'restorecon_private':
  src/selinux.c:252:16: error: assignment discards 'const' qualifier \
    from pointer target type [-Werror=discarded-qualifiers]
    252 |   if (!(constr = context_str (tcontext)))
      |                ^

* src/selinux.c (defaultcon): Define CONSTR as const.
(restorecon_private): Likewise.
---
 src/selinux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/selinux.c b/src/selinux.c
index 2bd91d071..d56010bba 100644
--- a/src/selinux.c
+++ b/src/selinux.c
@@ -115,7 +115,7 @@ defaultcon (struct selabel_handle *selabel_handle,
   char *tcon = NULL;
   context_t scontext = 0, tcontext = 0;
   char const *contype;
-  char *constr;
+  char const *constr;
   char *newpath = NULL;
 
   if (! IS_ABSOLUTE_FILE_NAME (path))
@@ -183,7 +183,7 @@ restorecon_private (struct selabel_handle *selabel_handle, 
char const *path)
   char *tcon = NULL;
   context_t scontext = 0, tcontext = 0;
   char const *contype;
-  char *constr;
+  char const *constr;
   int fd;
 
   if (!selabel_handle)
-- 
2.39.2