quickly fix newly introdued off-by-one

diff --git a/ext/standard/math.c b/ext/standard/math.c
index a8dec98310686425dfe88525ad8bbc46f2eda3d5..28ca2557212bc6ce6948666746c243a197df34a5 100644 (file)
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -718,7 +718,7 @@ _php_math_basetozval(zval *arg, int base, zval *ret) {
 
        s = Z_STRVAL_P(arg);
 
-       for (i = Z_STRLEN_P(arg); i >= 0; i--) {
+       for (i = Z_STRLEN_P(arg); i > 0; i--) {
                c = *s++;
 
                digit = (c >= '0' && c <= '9') ? c - '0'