Bug #58257 mysqltest: in if(), ! $var with space is always false

Evaluation would start with the space and thus ignore the $
Added while() to skip past white space

client/mysqltest.cc

@@ -5434,7 +5434,9 @@ void do_block(enum block_cmd cmd, struct st_command* command)
   if (*expr_start == '!')
   {
     not_expr= TRUE;
-    expr_start++; /* Step past the '!' */
+    expr_start++; /* Step past the '!', then any whitespace */
+    while (*expr_start && my_isspace(charset_info, *expr_start))
+      expr_start++;
   }
   /* Find ending ')' */
   expr_end= strrchr(expr_start, ')');

mysql-test/r/mysqltest.result

@@ -402,7 +402,9 @@ true-inner
 true-inner again
 true-outer
 Counter is greater than 0, (counter=10)
+Counter should still be 10, is 10
 Counter is not 0, (counter=0)
+Not space var works
 Counter is true, (counter=alpha)
 Beta is true
 while with string, only once

mysql-test/t/mysqltest.test

@@ -1138,6 +1138,11 @@ if (!$counter)
 {
   echo Counter is not 0, (counter=10);
 }
+if (! $counter)
+{
+  let $counter=5;
+}
+echo Counter should still be 10, is $counter;
 let $counter=0;
 if($counter)
 {
@@ -1147,6 +1152,10 @@ if (!$counter)
 {
   echo Counter is not 0, (counter=0);
 }
+if (! $counter)
+{
+  echo Not space var works;
+}
 
 # ----------------------------------------------------------------------------
 # Test if with some non-numerics