Fix code warning.

Change-Id: Ib11fb49f528d3688351ae349d5b4e307c28b3967
diff --git a/mbtk/mbtk_gnssd/agps/8122_agnss.c b/mbtk/mbtk_gnssd/agps/8122_agnss.c
index 34eef09..0bb7c5a 100755
--- a/mbtk/mbtk_gnssd/agps/8122_agnss.c
+++ b/mbtk/mbtk_gnssd/agps/8122_agnss.c
@@ -27,7 +27,7 @@
 
 static int hd_agnss_uart_write(uint8_t *buf, uint32_t len)
 {
-    int TxLen;
+    int TxLen = -1;
     if(hd_fd > 0)
     {
         TxLen = write(hd_fd,buf,len);
@@ -80,7 +80,7 @@
     return src_len + 8;
 }
 
-/************************************time inject*************************************/ 
+/************************************time inject*************************************/
 static int gnss_inject_time(HD_AGNSS_UTC_TIME_TYPE *time)
 {
     uint8_t cmd[24] = {0}; /* packet head+payload */
@@ -185,7 +185,7 @@
     return 0;
 }
 
-/************************************eph data inject*************************************/ 
+/************************************eph data inject*************************************/
 /**
 * @brief get the eph frame and send to HD80xx
 * @param data: the pointer of the eph data file
@@ -207,12 +207,12 @@
         LOGE("malloc fail");
         return INJECT_RESULT_FAIL;
     }
-    
+
     eph_file_fd = open(eph_file_path, O_RDWR);
     if (eph_file_fd <= 0)
     {
         LOGE("%s open file FAIL. errno:%d\n", __FUNCTION__, errno);
-        goto error; 
+        goto error;
     }
     while(0 < (size = read(eph_file_fd, (databuf + left_size), BUFFER_SIZE)))
     {
@@ -230,7 +230,7 @@
                     if(write_size < 0)
                     {
                         LOGE("hd_agnss_uart_write fail");
-                        goto error; 
+                        goto error;
                     }
                     LOGD("%s Write[%d]\r\n", __FUNCTION__, write_size);
                     hd_agnss_delay(50);
@@ -281,7 +281,7 @@
             }
         }
     }
-    
+
     if(databuf)
     {
         free(databuf);
@@ -326,17 +326,17 @@
                             HD_AGNSS_UTC_TIME_TYPE *UTC_time)
 {
     int ret = INJECT_RESULT_SUCCESS;
-    if (UTC_time != NULL) 
+    if (UTC_time != NULL)
     {
         gnss_inject_time(UTC_time);
     }
 
-    if ((latitude != 0) && (longitude != 0)) 
+    if ((latitude != 0) && (longitude != 0))
     {
         gnss_inject_location(latitude, longitude, altitude, accuracy);
     }
 
-    if (eph_file_path != NULL) 
+    if (eph_file_path != NULL)
     {
         ret = gnss_eph_inject_data(eph_file_path);
         if(ret < 0)