target/xtensa: gdbstub: drop dead return statement

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

target/xtensa/gdbstub.c

@@ -72,7 +72,6 @@ int xtensa_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
                       __func__, n, reg->type);
         memset(mem_buf, 0, reg->size);
         return reg->size;
-        return 0;
     }
 }