env--helper: mark a file-local symbol as static

Signed-off-by: Ramsay Jones <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ramsay-jones

builtin/env--helper.c

@@ -7,7 +7,7 @@ static char const * const env__helper_usage[] = {
 	NULL
 };
 
-enum {
+static enum {
 	ENV_HELPER_TYPE_BOOL = 1,
 	ENV_HELPER_TYPE_ULONG
 } cmdmode = 0;