ngx-releng: check tab indentations.

Author: agentzh

ngx-releng

@@ -17,6 +17,7 @@ ack '(?<=\#define)\s*DDEBUG\s*[1-9]' src /dev/null && exit 1
 ack '.{81}' $cfiles /dev/null
 ack '(?<!:)//' $cfiles /dev/null
 ack '[ \t]+$' $cfiles /dev/null
+ack '^\s*?\t\s*\S' $cfiles /dev/null
 ack '^master_on' `find t -name '*.t'` /dev/null
 ack 'if \( |if \(! |if \(.*? \)' $cfiles /dev/null
 ack '\--- *(?:ONLY|LAST)' `find t -name '*.t'` /dev/null