- fix some style(9) nits with my last commit

- add a comment explaining why I used '|' instead of '||'

Submitted by:	danfe@
Approved by:	emaste@

lib/libc/string/strcasecmp.c

@@ -73,6 +73,7 @@ strncasecmp_l(const char *s1, const char *s2, size_t n, locale_t locale)
 			*us1 = (const u_char *)s1,
 			*us2 = (const u_char *)s2;
 	
+	/* use a bitwise or to avoid an additional branch instruction */
 	if ((s1 == s2) | (n == 0))
 		return (0);
 

lib/libc/string/strncmp.c

@@ -39,6 +39,7 @@ int
 strncmp(const char *s1, const char *s2, size_t n)
 {
 
+	/* use a bitwise or to avoid an additional branch instruction */
 	if ((n == 0) | (s1 == s2))
 		return (0);