str: fix tests on unsigned chars, and !HAVE_ISBLANK.

[ccan] / ccan / str / test / compile_fail-isxdigit.c

diff --git a/ccan/str/test/compile_fail-isxdigit.c b/ccan/str/test/compile_fail-isxdigit.c
index 6a7377fd6d16862a7efad1b90a9b2bbd5c80123f..65e6006a885b029ae7cec620a44aebd652567e22 100644 (file)
--- a/ccan/str/test/compile_fail-isxdigit.c
+++ b/ccan/str/test/compile_fail-isxdigit.c
@@ -15,8 +15,7 @@ int main(int argc, char *argv[])
 
 #ifdef FAIL
        /* Fake fail on unsigned char platforms. */
-       c = 255;
-       BUILD_ASSERT(c < 0);
+       BUILD_ASSERT((char)255 < 0);
 #endif
 
        return isxdigit(c);