accel/tcg: Remove double bswap for helper_atomic_sto_*_mmu

This crept in as either a cut-and-paste error, or rebase error.

Fixes: cfec388518 ("atomic_template: add inline trace/plugin helpers")
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210729004647.282017-24-richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/atomic_template.h

@@ -251,7 +251,6 @@ void ATOMIC_NAME(st)(CPUArchState *env, target_ulong addr, ABI_TYPE val,
                                          PAGE_WRITE, retaddr);
     uint16_t info = atomic_trace_st_pre(env, addr, oi);
 
-    val = BSWAP(val);
     val = BSWAP(val);
     atomic16_set(haddr, val);
     ATOMIC_MMU_CLEANUP;