vinput: Fix missing error code

linD026 · linD026 · commit d81d968b0e18 · 2022-11-04T01:16:14.000+08:00
Fix the missing error code when register_chrdev() failed.
The report is from Smatch:

Smatch failed: 1 warning(s), 0 error(s)
/home/runner/work/lkmpg/lkmpg/examples/vinput.c:372 vinput_init() warn: missing error code 'err'
diff --git a/examples/vinput.c b/examples/vinput.c
@@ -369,6 +369,7 @@ static int __init vinput_init(void)
     vinput_dev = register_chrdev(0, DRIVER_NAME, &vinput_fops);
     if (vinput_dev < 0) {
         pr_err("vinput: Unable to allocate char dev region\n");
+        err = vinput_dev;
         goto failed_alloc;
     }
 

Original file line number	Diff line number	Diff line change
`@@ -369,6 +369,7 @@ static int __init vinput_init(void)`
`369`	`369`	`vinput_dev = register_chrdev(0, DRIVER_NAME, &vinput_fops);`
`370`	`370`	`if (vinput_dev < 0) {`
`371`	`371`	`pr_err("vinput: Unable to allocate char dev region\n");`
	`372`	`+ err = vinput_dev;`
`372`	`373`	`goto failed_alloc;`
`373`	`374`	`}`
`374`	`375`