Remove trailing whitespace

Change-Id: If8fe9e65056e458e946ff202cf7ae93efc8abf17
diff --git a/src/gb_proxy.c b/src/gb_proxy.c
index 43d819d..34e63e3 100644
--- a/src/gb_proxy.c
+++ b/src/gb_proxy.c
@@ -37,7 +37,7 @@
 #include <osmocom/core/talloc.h>
 #include <osmocom/core/select.h>
 #include <osmocom/core/rate_ctr.h>
-#include <osmocom/core/signal.h> 
+#include <osmocom/core/signal.h>
 #include <osmocom/core/stats.h>
 #include <osmocom/core/utils.h>