misc: msp430: fix mem leak on invalid draw/erase message

Signed-off-by: Joe Swantek <w98568@motorola.com>
Change-Id: Ib67e2e095ff14a69b88bf0bf7a6a1b35c0fd40f6
Reviewed-on: http://gerrit.pcs.mot.com/600590
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Joseph Swantek <jswantek@motorola.com>
Reviewed-by: Patrick Auchter <auchter@motorola.com>
Reviewed-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Reviewed-by: Jared Suttles <jsuttles@motorola.com>
Reviewed-by: Fred Fettinger <fettinge@motorola.com>
Reviewed-by: Stephen Rossbach <rossbach@motorola.com>
SLTApproved: Stephen Rossbach <rossbach@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>