style fix: remove tabs and trailing spaces

src/http/ngx_http.c

diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 492cfa0..7b109ca 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1779,11 +1779,11 @@
 
         if (prev_keys == NULL) {
 
-	    if (ngx_http_set_default_types(cf, &prev_keys, default_types)
+            if (ngx_http_set_default_types(cf, &prev_keys, default_types)
                 != NGX_OK)
             {
-		return NGX_CONF_ERROR;
-	    }
+                return NGX_CONF_ERROR;
+            }
         }
 
         hash.hash = prev_types_hash;