Checks return code before nullifying db pointer.

Author: iwongu

boost_src/sqlite3pp.cpp

@@ -97,7 +97,9 @@ namespace sqlite3pp
     int rc = SQLITE_OK;
     if (db_) {
       rc = sqlite3_close(db_);
-      db_ = 0;
+      if (rc == SQLITE_OK) {
+        db_ = 0;
+      }
     }
 
     return rc;

headeronly_src/sqlite3pp.ipp

@@ -114,7 +114,9 @@ namespace sqlite3pp
     auto rc = SQLITE_OK;
     if (db_) {
       rc = sqlite3_close(db_);
-      db_ = nullptr;
+      if (rc == SQLITE_OK) {
+        db_ = nullptr;
+      }
     }
 
     return rc;

src/sqlite3pp.cpp

@@ -116,7 +116,9 @@ namespace sqlite3pp
     auto rc = SQLITE_OK;
     if (db_) {
       rc = sqlite3_close(db_);
-      db_ = nullptr;
+      if (rc == SQLITE_OK) {
+        db_ = nullptr;
+      }
     }
 
     return rc;