Test printf space padding regression

tests/Makefile

@@ -41,6 +41,7 @@ EXPECT_NAMES=\
 	stdio/scanf \
 	stdio/setvbuf \
 	stdio/sprintf \
+	stdio/printf_space_pad \
 	stdlib/a64l \
 	stdlib/alloc \
 	stdlib/atof \

tests/expected/stdio/printf_space_pad.stdout

+A  B

tests/stdio/printf_space_pad.c

+#include <stdio.h>
+int main() {
+  printf ("%s%*s\n","A", 3, "B");
+}