[PATCH spice-server] reds: use a single field for RedsClientMonitorsConfig buffer size

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

buffer_pos was just the buffer size beside for a short time
during buffer reallocation so just use a field.

Change suggested by Christophe Fergeau.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/reds-private.h | 1 -
 server/reds.c         | 9 ++++-----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/server/reds-private.h b/server/reds-private.h
index 915bcf6..7e927fe 100644
--- a/server/reds-private.h
+++ b/server/reds-private.h
@@ -64,7 +64,6 @@ typedef struct RedsMigTargetClient {
 typedef struct RedsClientMonitorsConfig {
     uint8_t *buffer;
     int buffer_size;
-    int buffer_pos;
 } RedsClientMonitorsConfig;
 
 typedef struct ChannelSecurityOptions ChannelSecurityOptions;
diff --git a/server/reds.c b/server/reds.c
index 09b674d..8866c9d 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -1106,7 +1106,7 @@ static void reds_client_monitors_config_cleanup(RedsState *reds)
 {
     RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
 
-    cmc->buffer_size = cmc->buffer_pos = 0;
+    cmc->buffer_size = 0;
     free(cmc->buffer);
     cmc->buffer = NULL;
 }
@@ -1118,11 +1118,10 @@ static void reds_on_main_agent_monitors_config(RedsState *reds,
     VDAgentMonitorsConfig *monitors_config;
     RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
 
-    cmc->buffer_size += size;
-    cmc->buffer = realloc(cmc->buffer, cmc->buffer_size);
+    cmc->buffer = realloc(cmc->buffer, cmc->buffer_size + size);
     spice_assert(cmc->buffer);
-    memcpy(cmc->buffer + cmc->buffer_pos, message, size);
-    cmc->buffer_pos += size;
+    memcpy(cmc->buffer + cmc->buffer_size, message, size);
+    cmc->buffer_size += size;
     msg_header = (VDAgentMessage *)cmc->buffer;
     if (sizeof(VDAgentMessage) > cmc->buffer_size ||
             msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) {
-- 
2.9.4

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