arm: remove dead assignments, spotted by clang analyzer

Value stored is never read.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/omap2.c

diff --git a/hw/omap2.c b/hw/omap2.c
index a3fa89d..bd1b35e 100644
--- a/hw/omap2.c
+++ b/hw/omap2.c
@@ -1968,7 +1968,7 @@
 
     s->irq = irq;
     s->codec.rxdrq = *drq ++;
-    s->codec.txdrq = *drq ++;
+    s->codec.txdrq = *drq;
     omap_eac_reset(s);
 
 #ifdef HAS_AUDIO