Fix common util judge error (#835)

*  '#831 fix exe_path judge error'

* #831 fix exe_path judge error

CHANGELOG.md

@@ -8,6 +8,7 @@ Please mark all change in change log and use the issue from GitHub
 - \#715 - Milvus crash when searching and building index simultaneously using SQ8H
 - \#744 - Don't return partition table for show_tables
 - \#770 - Server unittest run failed on low-end server
+- \#831 - Judge branch error in CommonUtil.cpp
 
 ## Feature
 - \#216 - Add CLI to get server info

core/src/utils/CommonUtil.cpp

@@ -190,7 +190,7 @@ CommonUtil::GetExePath() {
     buf[cnt] = '\0';
 
     std::string exe_path = buf;
-    if (exe_path.rfind('/') != exe_path.length()) {
+    if (exe_path.rfind('/') != exe_path.length() - 1) {
         std::string sub_str = exe_path.substr(0, exe_path.rfind('/'));
         return sub_str + "/";
     }