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

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

diff --git a/ccan/str/test/compile_fail-isalnum.c b/ccan/str/test/compile_fail-isalnum.c
index 1b6a3633bdd3234e15b0352d0efd789e551c3632..930defffa0c231862679e42ddb851655cf5a93a1 100644 (file)
--- a/ccan/str/test/compile_fail-isalnum.c
+++ b/ccan/str/test/compile_fail-isalnum.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 isalnum(c);