MariaRocks: fix a bug in MariaDB: SHOW STATUS LIKE shows extra rows

SHOW STATUS LIKE 'pattern' returned Rocksdb_XXX status variables
that had SHOW_FUNC type but didn't match the pattern (for example
Rocksdb_block_cache_add).

Among other things, this caused MTR to assume that each testcase
has damaged the execution environment.

The issue was a unitialized variable and then a typo in the condition
that checks if variable name matches the pattern.

sql/sql_show.cc

@@ -3394,7 +3394,7 @@ static bool show_status_array(THD *thd, const char *wild,
 
   for (; variables->name; variables++)
   {
-    bool wild_checked;
+    bool wild_checked= false;
     strnmov(prefix_end, variables->name, len);
     name_buffer[sizeof(name_buffer)-1]=0;       /* Safety */
 
@@ -3460,8 +3460,8 @@ static bool show_status_array(THD *thd, const char *wild,
     else
     {
       if ((wild_checked ||
-           (wild && wild[0] && wild_case_compare(system_charset_info,
-                                                 name_buffer, wild))) &&
+           !(wild && wild[0] && wild_case_compare(system_charset_info,
+                                                  name_buffer, wild))) &&
           (!cond || cond->val_int()))
       {
         const char *pos;                  // We assign a lot of const's