vi: fix regex search compilation error

Building with FEATURE_VI_REGEX_SEARCH enabled fails.
Signed-off-by: NRon Yorston <rmy@pobox.com>
Signed-off-by: NBernhard Reutner-Fischer <rep.dot.nop@gmail.com>

editors/vi.c

@@ -2684,7 +2684,7 @@ static char *expand_args(char *args)
 static char *strchr_backslash(const char *s, int c)
 {
 	while (*s) {
-		if (*s == c) {
+		if (*s == c)
 			return (char *)s;
 		if (*s == '\\')
 			if (*++s == '\0')