Surround multiline macros

ma_helper.h:97:3: warning: macro expands to multiple statements [-Wmultistatement-macros]
   97 |   free((a));\
      |   ^~~~
ma_string.c:387:5: note: in expansion of macro 'MADB_FREE'
  387 |     MADB_FREE(StmtStr);
      |     ^~~~~~~~~
ma_string.c:386:3: note: some parts of macro expansion are not guarded by this 'if' clause
  386 |   if (StmtStr)
      |   ^~

ma_error.h:163:3: warning: macro expands to multiple statements [-Wmultistatement-macros]
  163 |   strcpy_s((a)->SqlState, SQL_SQLSTATE_SIZE+1, MADB_ErrorList[MADB_ERR_00000].SqlState); \
      |   ^~~~~~~~
ma_platform_posix.c:256:5: note: in expansion of macro 'MADB_CLEAR_ERROR'
  256 |     MADB_CLEAR_ERROR(Error);
      |     ^~~~~~~~~~~~~~~~
ma_platform_posix.c:255:3: note: some parts of macro expansion are not guarded by this 'if' clause
  255 |   if (Error)
      |   ^~

ma_error.h

@@ -159,12 +159,13 @@ SQLRETURN MADB_GetDiagField(SQLSMALLINT HandleType, SQLHANDLE Handle,
                             DiagInfoPtr, SQLSMALLINT BufferLength,
                             SQLSMALLINT *StringLengthPtr, my_bool isWChar);
 
-#define MADB_CLEAR_ERROR(a) \
+#define MADB_CLEAR_ERROR(a) do { \
   strcpy_s((a)->SqlState, SQL_SQLSTATE_SIZE+1, MADB_ErrorList[MADB_ERR_00000].SqlState); \
   (a)->SqlErrorMsg[(a)->PrefixLen]= 0; \
   (a)->NativeError= 0;\
   (a)->ReturnValue= SQL_SUCCESS;\
-  (a)->ErrorNum= 0;
+  (a)->ErrorNum= 0; \
+} while (0)
 
 #define MADB_CLEAR_HANDLE_ERROR(handle_type, handle) \
   switch (handle_type) { \

ma_helper.h

@@ -93,9 +93,11 @@ extern my_bool DummyError;
 
 #define BUFFER_CHAR_LEN(blen,wchar) (wchar) ? (blen) / sizeof(SQLWCHAR) : (blen)
 
-#define MADB_FREE(a) \
+#define MADB_FREE(a) do { \
   free((a));\
-  (a)= NULL;
+  (a)= NULL; \
+} while(0)
+
 #define MADB_ALLOC(a) malloc((a))
 #define MADB_CALLOC(a) calloc((a) > 0 ? (a) : 1, sizeof(char))
 #define MADB_REALLOC(a,b) realloc((a),(b))