Clean up a couple issues where building the code with a C++ reported build errors.

1. Typecasting the return from malloc.
2. strncpy() checking.

Author: ejohnstown

examples/echoserver/echoserver.c

@@ -588,20 +588,20 @@ static int shell_worker(thread_ctx_t* threadCtx)
         memset((void *)&buf_rx, 0, sizeof(buf_rx));
         memset((void *)&buf_tx, 0, sizeof(buf_tx));
 
-        buf_rx.buf = malloc(SE_BUF_SIZE);
+        buf_rx.buf = (char*)malloc(SE_BUF_SIZE);
         if (buf_rx.buf == NULL) {
             return WS_FATAL_ERROR;
         }
 
-        buf_tx.buf = malloc(SE_BUF_SIZE);
+        buf_tx.buf = (char*)malloc(SE_BUF_SIZE);
         if (buf_tx.buf == NULL) {
             free(buf_rx.buf);
             return WS_FATAL_ERROR;
         }
 
 #ifdef WOLFSSH_AGENT
         memset((void *)&agent_buf, 0, sizeof(agent_buf));
-        agent_buf.buf = malloc(SE_BUF_SIZE);
+        agent_buf.buf = (char*)malloc(SE_BUF_SIZE);
         if (agent_buf.buf == NULL) {
             free(buf_rx.buf);
             free(buf_tx.buf);

src/wolfscp.c

@@ -2058,7 +2058,8 @@ int ScpPushDir(ScpSendCtx* ctx, const char* path, void* heap)
     }
 
     /* append directory name to ctx->dirName */
-    WSTRNCPY(ctx->dirName, path, DEFAULT_SCP_FILE_NAME_SZ);
+    WSTRNCPY(ctx->dirName, path, DEFAULT_SCP_FILE_NAME_SZ-1);
+    ctx->dirName[DEFAULT_SCP_FILE_NAME_SZ-1] = '\0';
 
     return WS_SUCCESS;
 }