improve readability of string: fix indentation and remove trailing spaces

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
diff --git a/libc/string/strpbrk.c b/libc/string/strpbrk.c
index 6ba3796..cd3b71c 100644
--- a/libc/string/strpbrk.c
+++ b/libc/string/strpbrk.c
@@ -38,7 +38,7 @@
 {
 	const char *scanp;
 	int c, sc;
-  
+
 	while ((c = *s1++) != 0) {
 		for (scanp = s2; (sc = *scanp++) != 0;)
 			if (sc == c)