shared-qmi: fix potentially uninitialized 'mcc' variable

mm-shared-qmi.c:358:9: error: variable 'mcc' is used uninitialized whenever '&&' condition is false [-Werror,-Wsometimes-uninitialized]
    if (operator_id && !mm_3gpp_parse_operator_id (operator_id, &mcc, &mnc, &error)) {
        ^~~~~~~~~~~
mm-shared-qmi.c:367:9: note: uninitialized use occurs here
    if (mcc) {
        ^~~
mm-shared-qmi.c:358:9: note: remove the '&&' if its condition is always true
    if (operator_id && !mm_3gpp_parse_operator_id (operator_id, &mcc, &mnc, &error)) {
        ^~~~~~~~~~~~~~
mm-shared-qmi.c:339:51: note: initialize the variable 'mcc' to silence this warning
    guint16                                    mcc;
                                                  ^
                                                   = 0

0 files changed, 0 insertions, 0 deletions