canonicalize_file_name is marked as taking a nonnull argument.

Signed-off-by: Mark Wielaard <[email protected]>
---
 libdwfl/ChangeLog        | 5 +++++
 libdwfl/find-debuginfo.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index dec3405..ffb34c0 100644
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-30  Mark Wielaard  <[email protected]>
+
+       * find-debuginfo.c (dwfl_standard_find_debuginfo): Check file_name is
+       not NULL before calling canonicalize_file_name.
+
 2015-05-24  Mark Wielaard  <[email protected]>
 
        * derelocate.c (check_module): Check mod is not NULL.
diff --git a/libdwfl/find-debuginfo.c b/libdwfl/find-debuginfo.c
index ac9a5e5..9b911c1 100644
--- a/libdwfl/find-debuginfo.c
+++ b/libdwfl/find-debuginfo.c
@@ -357,7 +357,7 @@ dwfl_standard_find_debuginfo (Dwfl_Module *mod,
                                   debuglink_file, debuglink_crc,
                                   debuginfo_file_name);
 
-  if (fd < 0 && errno == 0)
+  if (fd < 0 && errno == 0 && file_name != NULL)
     {
       /* If FILE_NAME is a symlink, the debug file might be associated
         with the symlink target name instead.  */
-- 
2.1.0

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