Fix warning about sign-mismatch comparisons

diff --git a/ext/standard/php_smart_string.h b/ext/standard/php_smart_string.h
index 1175d32907a9acd5640473ca99e583f095876846..ea2cc4bd6b1d48c46a339eef1459b971ddc265f3 100644 (file)
--- a/ext/standard/php_smart_string.h
+++ b/ext/standard/php_smart_string.h
@@ -61,7 +61,7 @@
                                : newlen + SMART_STRING_PREALLOC;                                       \
                SMART_STRING_DO_REALLOC(d, what);                                                       \
        } else {                                                                                                                \
-               if(UNEXPECTED(n > SIZE_MAX - (d)->len)) {                                       \
+               if(UNEXPECTED((size_t)n > SIZE_MAX - (d)->len)) {                                       \
                        zend_error(E_ERROR, "String size overflow");                    \
                }                                                                                                                       \
                newlen = (d)->len + (n);                                                                        \