Fix trailing whitespaces, moved the edge case check to reduce null check

sh.c

@@ -1789,14 +1789,14 @@ bool comp_switch(ast node) {
 
   node = get_child(node, 1);
 
-  if (node == 0 || (get_op(node) != '{' && get_op(node) != CASE_KW)) fatal_error("comp_statement: switch without body");
-
   if(get_op(node) == CASE_KW) {
-    // This is for the edge case where the entire 'statement' part of < switch ( expression ) statement > 
+    // This is for the edge case where the entire 'statement' part of < switch ( expression ) statement >
     // is a single < case constant-expression : statement >
     // therefore we wrap the case statement with a block statement to simplify down to the typical syntax
     node = new_ast2('{', node, 0);
   }
+
+  if (node == 0 || get_op(node) != '{') fatal_error("comp_statement: switch without body");
   while (get_op(node) == '{') {
     statement = get_child(node, 0);
     node = get_child(node, 1);