stats_prefix.c: Check for NDEBUG before using total_written variable

When using NDEBUG assert macro is ineffective which is caught by latest
clang and reports that total_written is set but unused. Therefore check
for NDEBUG to make sure assert is used only when its effective

Fixes
error: variable 'total_written' set but not used [-Werror,-Wunused-but-set-variable]
    size_t size = 0, written = 0, total_written = 0;
                                  ^

Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/stats_prefix.c b/stats_prefix.c
index 62f0d04..d72e514 100644
--- a/stats_prefix.c
+++ b/stats_prefix.c
@@ -127,8 +127,10 @@ char *stats_prefix_dump(int *length) {
     PREFIX_STATS *pfs;
     char *buf;
     int i, pos;
-    size_t size = 0, written = 0, total_written = 0;
-
+    size_t size = 0, written = 0;
+#ifndef NDEBUG
+    size_t total_written = 0;
+#endif
     /*
      * Figure out how big the buffer needs to be. This is the sum of the
      * lengths of the prefixes themselves, plus the size of one copy of
@@ -154,8 +156,10 @@ char *stats_prefix_dump(int *length) {
                            pfs->prefix, pfs->num_gets, pfs->num_hits,
                            pfs->num_sets, pfs->num_deletes);
             pos += written;
+#ifndef NDEBUG
             total_written += written;
             assert(total_written < size);
+#endif
         }
     }