[bug report] Input: add support for Azoteq IQS7222A/B/C

[Dan Carpenter <dan.carpenter@oracle.com>]

Hello Jeff LaBundy,

The patch e505edaedcb9: "Input: add support for Azoteq IQS7222A/B/C"
from Apr 8, 2022, leads to the following Smatch static checker
warning:

	drivers/input/misc/iqs7222.c:2166 iqs7222_parse_all()
	error: NULL dereference inside function 'iqs7222_parse_props()'

drivers/input/misc/iqs7222.c
    2150 static int iqs7222_parse_all(struct iqs7222_private *iqs7222)
    2151 {
    2152         const struct iqs7222_dev_desc *dev_desc = iqs7222->dev_desc;
    2153         const struct iqs7222_reg_grp_desc *reg_grps = dev_desc->reg_grps;
    2154         u16 *sys_setup = iqs7222->sys_setup;
    2155         int error, i;
    2156 
    2157         if (dev_desc->event_offset)
    2158                 sys_setup[dev_desc->event_offset] = IQS7222_EVENT_MASK_ATI;
    2159 
    2160         for (i = 0; i < reg_grps[IQS7222_REG_GRP_CYCLE].num_row; i++) {
    2161                 error = iqs7222_parse_cycle(iqs7222, i);
    2162                 if (error)
    2163                         return error;
    2164         }
    2165 
--> 2166         error = iqs7222_parse_props(iqs7222, NULL, 0, IQS7222_REG_GRP_GLBL,
                                                      ^^^^
This NULL is dereferenced inside iqs7222_parse_props() so this will
crash.

    2167                                     IQS7222_REG_KEY_NONE);
    2168         if (error)
    2169                 return error;
    2170 
    2171         for (i = 0; i < reg_grps[IQS7222_REG_GRP_GPIO].num_row; i++) {
    2172                 struct fwnode_handle *gpio_node = NULL;

regards,
dan carpenter