benchmark: change ts buffer allocation flow

1. Change timestamp buffer allocation/mapping flow
2. Add misc cosmetic fixes

In case if timestamp buffer is allocated in userspace and new register
user memory API is used for its registering in OP-TEE (introduced in
optee_client commit 27888d73d156 ("tee_client_api: register user memory")),
there is no possibility to keep this mapping permanent among different
TEEC_InvokeCommand invocations. All all SHM are automatically unmapped from
OP-TEE VA space after TEEC_InvokeCommand is handled by OP-TEE.

Fixes: https://github.com/OP-TEE/optee_os/issues/1979
Acked-by: Joakim Bech <joakim.bech@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
diff --git a/common.h b/common.h
index 645ba1a..a4f3ee9 100644
--- a/common.h
+++ b/common.h
@@ -36,7 +36,7 @@
 
 #ifdef DEBUG
 #define DBG(fmt, args...) printf("[" OUTPUT_APP_PREFIX \
-		"] DEBUG: %s:%d:%s(): " fmt "\n", __FILE__, __LINE__, __func__, ##args)
+	"] DEBUG: %s:%d:%s(): " fmt "\n", __FILE__, __LINE__, __func__, ##args)
 #else
 #define DBG(fmt, args...)
 #endif