qbe: Fix jnz controlled by short/char type

Although we don't need the cnew in this case, we still need to do
the appropriate extension to 32-bit.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/if-char.c b/test/if-char.c
new file mode 100644
index 0000000..c22d767
--- /dev/null
+++ b/test/if-char.c
@@ -0,0 +1,5 @@
+int main(void) {
+	if ((unsigned char)0x100)
+		return 1;
+	return 0;
+}