nimble/host: Fix compilation issues observed by enabling -O2 optimiza…

[rahult-github]

When O2 optimization is enabled, below error is thrown . This patch fixes the same.

nimble/host/src/ble_gattc.c: In function 'ble_gattc_find_inc_svcs_rx_adata':
nimble/host/src/ble_gattc.c:1982:25: note: 'service' declared here
1982 | struct ble_gatt_svc service;
| ^~~~~~~
In function 'ble_gattc_find_inc_svcs_cb',
inlined from 'ble_gattc_find_inc_svcs_rx_adata' at nimble/host/src/ble_gattc.c:2031:16:
nimble/host/src/ble_gattc.c:1832:14: error: 'service' may be used uninitialized [-Werror=maybe-uninitialized]
1832 | rc = proc->find_inc_svcs.cb(proc->conn_handle,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1833 | ble_gattc_error(status, att_handle),
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1834 | service, proc->find_inc_svcs.cb_arg);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nimble/host/src/ble_gattc.c:1832:14: note: by argument 3 of type 'const struct ble_gatt_svc *' to 'ble_gatt_disc_svc_fn' {aka 'int(short unsigned int, const struct ble_gatt_error *, const struct ble_gatt_svc *, void *)'}
nimble/host/src/ble_gattc.c: In function 'ble_gattc_find_inc_svcs_rx_adata':
nimble/host/src/ble_gattc.c:1982:25: note: 'service' declared here
1982 | struct ble_gatt_svc service;

[rahult-github]

Hi @sjanc , please take a look