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/strrchr.c b/libc/string/strrchr.c
index 2800781..4918f82 100644
--- a/libc/string/strrchr.c
+++ b/libc/string/strrchr.c
@@ -34,12 +34,12 @@
 strrchr(const char *p, int ch)
 {
 	char *save;
-  
+
 	for (save = NULL;; ++p) {
 		if (*p == ch)
 			save = (char *)p;
 		if (!*p)
 			return(save);
-  }
+	}
 	/* NOTREACHED */
 }