Trailing whitespace fix.

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 9a9bfc0..703017f 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1818,7 +1818,7 @@
             }
 
             c->log->action = "connecting to upstream";
-            (void) ngx_connection_error(c, err, 
+            (void) ngx_connection_error(c, err,
                                     "kevent() reported that connect() failed");
             return NGX_ERROR;
         }