tools/mkeficapsule.c: fix DEBUG build

Fix a missing comma sign (,) from a printf(), that is only
reachable if DEBUG is defined, in which case the build fails with:

    tools/mkeficapsule.c:266:36: error: expected ‘)’ before ‘bin’
      266 |  printf("\tbin: %s\n\ttype: %pUl\n" bin, guid);
          |                                    ^~~~
          |                                    )
Signed-off-by: NKlaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
Reviewed-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

tools/mkeficapsule.c

@@ -263,7 +263,7 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
 
 #ifdef DEBUG
 	printf("For output: %s\n", path);
-	printf("\tbin: %s\n\ttype: %pUl\n" bin, guid);
+	printf("\tbin: %s\n\ttype: %pUl\n", bin, guid);
 	printf("\tindex: %ld\n\tinstance: %ld\n", index, instance);
 #endif