staging: media: atomisp: fill properly hmm_bo_type_strings when ION is disabled

When CONFIG_ION is disabled, HMM_BO_LAST is 3. In this case, "i" should
not be added in hmm_bo_type_strings.
Signed-off-by: Jérémy Lefaure <jeremy.lefaure@lse.epita.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/pci/atomisp2/hmm/hmm.c

@@ -49,7 +49,9 @@ const char *hmm_bo_type_strings[HMM_BO_LAST] = {
 	"p", /* private */
 	"s", /* shared */
 	"u", /* user */
+#ifdef CONFIG_ION
 	"i", /* ion */
+#endif
 };
 
 static ssize_t bo_show(struct device *dev, struct device_attribute *attr,