fuzz: don't buffer stdout in afl stubs

... to avoid obscuring output.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

tools/fuzz/libelf/afl-libelf-fuzzer.c

@@ -13,6 +13,8 @@ int main(int argc, char **argv)
     size_t size;
     FILE *fp;
 
+    setbuf(stdout, NULL);
+
     if ( argc != 2 )
     {
         printf("Expecting only one argument\n");

tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c

@@ -13,6 +13,8 @@ int main(int argc, char **argv)
     size_t size;
     FILE *fp;
 
+    setbuf(stdout, NULL);
+
     if ( argc != 2 )
     {
         printf("Expecting only one argument\n");