ucm: Fix sysw sequence command not working when requesting to ignore errors

When the user requests to ignore sysfs write errors by prefixing
the path with a '-' then we need to skip the '-' when building the
actual path otherwise the write will never work.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/ucm/main.c

@@ -517,7 +517,10 @@ static int execute_sysw(const char *sysw)
 	if (sysw == NULL || *sysw == '\0')
 		return 0;
 
-	ignore_error = sysw[0] == '-';
+	if (sysw[0] == '-') {
+		ignore_error = true;
+		sysw++;
+	}
 
 	if (sysw[0] == ':')
 		return -EINVAL;