Fixed some errors & warnings found by clang

- pcretest.c could use macro with side effect
- maria_chk could access freed memory
- Initialized some variables that could be accessed uninitalized
- Fixed compiler warning in my_atomic-t.c

pcre/pcretest.c

@@ -2864,7 +2864,8 @@ strncmpic(pcre_uint8 *s, pcre_uint8 *t, int n)
 {
 while (n--)
   {
-  int c = tolower(*s++) - tolower(*t++);
+  int c = tolower(*s) - tolower(*t);
+  s++; t++;
   if (c) return c;
   }
 return 0;

storage/maria/maria_chk.c

@@ -974,6 +974,7 @@ static int maria_chk(HA_CHECK *param, char *filename)
   int error,lock_type,recreate;
   uint warning_printed_by_chk_status;
   my_bool rep_quick= MY_TEST(param->testflag & (T_QUICK | T_FORCE_UNIQUENESS));
+  my_bool born_transactional;
   MARIA_HA *info;
   File datafile;
   char llbuff[22],llbuff2[22];
@@ -1416,6 +1417,7 @@ static int maria_chk(HA_CHECK *param, char *filename)
   maria_lock_database(info, F_UNLCK);
 
 end2:
+  born_transactional= share->base.born_transactional;
   if (maria_close(info))
   {
     _ma_check_print_error(param, default_close_errmsg, my_errno, filename);
@@ -1431,7 +1433,7 @@ static int maria_chk(HA_CHECK *param, char *filename)
                                       MYF(MY_REDEL_MAKE_BACKUP) : MYF(0)));
   }
   if (opt_transaction_logging &&
-      share->base.born_transactional && !error &&
+      born_transactional && !error &&
       (param->testflag & (T_REP_ANY | T_SORT_RECORDS | T_SORT_INDEX |
                           T_ZEROFILL)))
     error= write_log_record(param);

storage/mroonga/vendor/groonga/lib/ts.c

@@ -683,7 +683,7 @@ static grn_rc
 grn_ts_select_output(grn_ctx *ctx, grn_obj *table, grn_ts_str str,
                      const grn_ts_record *in, size_t n_in, size_t n_hits)
 {
-  grn_ts_writer *writer;
+  grn_ts_writer *writer= 0;
   grn_rc rc = grn_ts_writer_open(ctx, table, str, &writer);
   if (rc != GRN_SUCCESS) {
     return rc;

storage/mroonga/vendor/groonga/lib/ts/ts_expr_node.c

@@ -5173,7 +5173,7 @@ grn_ts_expr_node_deref(grn_ctx *ctx, grn_ts_expr_node **node_ptr)
 {
   grn_ts_expr_node *node = *node_ptr, **in_ptr = NULL;
   while ((node->data_kind & ~GRN_TS_VECTOR_FLAG) == GRN_TS_REF) {
-    grn_ts_expr_node *new_node;
+    grn_ts_expr_node *new_node= 0;
     grn_rc rc = grn_ts_expr_node_deref_once(ctx, node, &new_node);
     if (rc != GRN_SUCCESS) {
       if (in_ptr) {

unittest/mysys/my_atomic-t.c

@@ -90,10 +90,10 @@ pthread_handler_t test_atomic_cas(void *arg)
     y= my_atomic_load32(&bad);
     x= (x*m+0x87654321) & INT_MAX32;
     do {
-      ok= my_atomic_cas32(&bad, &y, (uint32)y+x);
+      ok= my_atomic_cas32((int32*) &bad, &y, y+x);
     } while (!ok) ;
     do {
-      ok= my_atomic_cas32(&bad, &y, y-x);
+      ok= my_atomic_cas32((int32*) &bad, &y, y-x);
     } while (!ok) ;
   }
   return 0;