common/rc: fix up variable naming

Remove the leading underscore from local variable names, and add a
leading underscore to $err_msg to reflect its status as a global
variable shared by 'check' and 'common/report'.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
3 files changed