Set blockSize when reading luminance-alpha format

Turo Lamminen

2015-04-30 d3d39e5b5f9945e9b45b7c80d4d9af5992c74098

 mojodds.c

@@ -269,6 +269,7 @@
        *_glfmt = GL_LUMINANCE_ALPHA;

        calcSizeFlag = DDSD_PITCH;
        blockSize = 2;
        calcSize = ((width * header->ddspf.dwRGBBitCount) + 7) / 8;
    }