Fix warning from gcc

diff --git a/lib/ast/strmatch.c b/lib/ast/strmatch.c
index faa83dd224b19034ed03fc65eae9b4bd7aa97a72..3e374a9c910ea9368ab4c37c8b836276153e27a6 100644 (file)
--- a/lib/ast/strmatch.c
+++ b/lib/ast/strmatch.c
@@ -146,7 +146,7 @@ typedef struct {
 #endif
 
 #ifndef isxdigit
-#define isxdigit(c)    ((c)>='0'&&(c)<='9'||(c)>='a'&&(c)<='f'||(c)>='A'&&(c)<='F')
+#define isxdigit(c)    (((c)>='0'&&(c)<='9')||((c)>='a'&&(c)<='f')||((c)>='A'&&(c)<='F'))
 #endif
 
 #define getsource(s,e) (((s)>=(e))?0:mbgetchar(s))