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libip: avoid parentesis warnings from gcc (from drawterm)

--- a/sys/src/libip/parseip.c

+++ b/sys/src/libip/parseip.c

@@ -40,7 +40,7 @@

 static int

 ipcharok(int c)

 {

-	return c == '.' || c == ':' || isascii(c) && isxdigit(c);

+	return c == '.' || c == ':' || (isascii(c) && isxdigit(c));

 }

 static int

@@ -48,7 +48,7 @@

 {

 	if(c == '\0')

 		return 1;

-	if(c == '.' || c == ':' || isascii(c) && isalnum(c))

+	if(c == '.' || c == ':' || (isascii(c) && isalnum(c)))

 		return 0;

 	return 1;

 }

@@ -83,7 +83,7 @@

 			break;

 		}

 		/* v6: at most 4 hex digits, followed by colon or delim */

-		if(x != (ushort)x || *p != ':' && !delimchar(*p)) {

+		if(x != (ushort)x || (*p != ':' && !delimchar(*p))) {

 			memset(to, 0, IPaddrlen);

 			return -1;			/* parse error */

 		}