regcomp.h: Parenthesize param in macro expansion

This is always a good idea

diff --git a/regcomp.h b/regcomp.h
index 5715e22..d9f2cbe 100644 (file)
--- a/regcomp.h
+++ b/regcomp.h
@@ -336,7 +336,7 @@ struct regnode_ssc {
 #define MASK(p)                ((char*)OPERAND(p))
 #define        STR_LEN(p)      (((struct regnode_string *)p)->str_len)
 #define        STRING(p)       (((struct regnode_string *)p)->string)
-#define STR_SZ(l)      ((l + sizeof(regnode) - 1) / sizeof(regnode))
+#define STR_SZ(l)      (((l) + sizeof(regnode) - 1) / sizeof(regnode))
 #define NODE_SZ_STR(p) (STR_SZ(STR_LEN(p))+1)
 
 #undef NODE_ALIGN