macro: don't rely on C's downgrade-to-bool feature for numeric comparisons

diff --git a/src/basic/macro.h b/src/basic/macro.h
index 6b3c3d04df9e85c997cdf5426547fa1d86288c0b..cd3ae8d3ab734cba17790739dc0e73f783e0c379 100644 (file)
--- a/src/basic/macro.h
+++ b/src/basic/macro.h
@@ -350,7 +350,7 @@ static inline unsigned long ALIGN_POWER2(unsigned long u) {
         ({                                              \
                 typeof(x) _x_ = (x);                    \
                 unsigned ans = 1;                       \
-                while (_x_ /= 10)                       \
+                while ((_x_ /= 10) != 0)                \
                         ans++;                          \
                 ans;                                    \
         })