g2meet: Allocate cursor buffers large enough to fit the aligned width

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/g2meet.c

@@ -488,7 +488,7 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
     cursor_hot_y  = bytestream2_get_byte(gb);
     cursor_fmt    = bytestream2_get_byte(gb);
 
-    cursor_stride = cursor_w * 4;
+    cursor_stride = FFALIGN(cursor_w, 32) * 4;
 
     if (cursor_w < 1 || cursor_w > 256 ||
         cursor_h < 1 || cursor_h > 256) {