msm: mdss: fix typo in the error message for multirect validation

If during the multirect validation an error is found,
driver tries to print the both rectangles causing
the error. Currently the printed values are wrong
due a typo on the height of the rectangles, this is
misleading to debug the actual errors.

Change-Id: Ic48e3a65b19c378deff7e5c149d5b30aca6e73c7
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>