write.c: warn if WIM file cannot be truncated

Somewhat pointless since this is already an error path, but this avoids
a gcc warning about ftruncate()'s return value not being used.

diff --git a/src/write.c b/src/write.c
index 9f48d3f1ded5973d1a215c5cd4b23f9f391d5d12..cc569395d19c12f3f499b5a68f8523f33e5055bd 100644 (file)
--- a/src/write.c
+++ b/src/write.c
@@ -3223,9 +3223,8 @@ out_truncate:
                             WIMLIB_WRITE_FLAG_UNSAFE_COMPACT))) {
                WARNING("Truncating \"%"TS"\" to its original size "
                        "(%"PRIu64" bytes)", wim->filename, old_wim_end);
                             WIMLIB_WRITE_FLAG_UNSAFE_COMPACT))) {
                WARNING("Truncating \"%"TS"\" to its original size "
                        "(%"PRIu64" bytes)", wim->filename, old_wim_end);

-               /* Return value of ftruncate() is ignored because this is
-                * already an error path.  */
-               (void)ftruncate(wim->out_fd.fd, old_wim_end);
+               if (ftruncate(wim->out_fd.fd, old_wim_end))
+                       WARNING_WITH_ERRNO("Failed to truncate WIM file!");

        }
 out_restore_hdr:
        (void)write_wim_header_flags(wim->hdr.flags, &wim->out_fd);
        }
 out_restore_hdr:
        (void)write_wim_header_flags(wim->hdr.flags, &wim->out_fd);