The branch main has been updated by avg:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=b416345d5b13c77d82708cab94f43cb6144fbaf7

commit b416345d5b13c77d82708cab94f43cb6144fbaf7
Author:     Andriy Gapon <[email protected]>
AuthorDate: 2021-12-13 11:10:12 +0000
Commit:     Andriy Gapon <[email protected]>
CommitDate: 2021-12-13 11:39:08 +0000

    pcf8591: remove write-only variables
    
    MFC after:      1 week
---
 sys/dev/iicbus/pcf8591.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/sys/dev/iicbus/pcf8591.c b/sys/dev/iicbus/pcf8591.c
index ff769b368d91..5bae3f0f272c 100644
--- a/sys/dev/iicbus/pcf8591.c
+++ b/sys/dev/iicbus/pcf8591.c
@@ -141,14 +141,12 @@ pcf8591_select_channel(device_t dev, int channel)
 static int
 pcf8591_channel_sysctl(SYSCTL_HANDLER_ARGS)
 {
-       struct pcf8591_softc *sc;
        device_t dev;
        int error, channel, val;
        uint8_t reading;
 
        dev = arg1;
        channel = arg2;
-       sc = device_get_softc(dev);
 
        if (req->oldptr != NULL) {
                error = pcf8591_select_channel(dev, channel);
@@ -173,7 +171,6 @@ pcf8591_start(void *arg)
        struct sysctl_oid_list *tree;
        struct sysctl_oid *inputs_node;
        struct sysctl_oid_list *inputs;
-       int error;
 
        sc = arg;
        dev = sc->sc_dev;
@@ -188,7 +185,7 @@ pcf8591_start(void *arg)
        sc->sc_cfg = 0;
        sc->sc_output = 0;
        sc->sc_ch_count = 4;
-       error = pcf8591_set_config(dev);
+       (void)pcf8591_set_config(dev);
 
        ctx = device_get_sysctl_ctx(dev);
        tree_node = device_get_sysctl_tree(dev);

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