Input: iqs7222 - avoid sending empty SYN_REPORT events

Add a check to prevent sending undefined events, which ultimately
map to SYN_REPORT.

Fixes: e505edae ("Input: add support for Azoteq IQS7222A/B/C")
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20220908131548.48120-7-jeff@labundy.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/iqs7222.c

@@ -2326,6 +2326,9 @@ static int iqs7222_report(struct iqs7222_private *iqs7222)
 			int k = 2 + j * (num_chan > 16 ? 2 : 1);
 			u16 state = le16_to_cpu(status[k + i / 16]);
 
+			if (!iqs7222->kp_type[i][j])
+				continue;
+
 			input_event(iqs7222->keypad,
 				    iqs7222->kp_type[i][j],
 				    iqs7222->kp_code[i][j],