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/strchr.c b/libc/string/strchr.c
index e33694c..31ba4e2 100644
--- a/libc/string/strchr.c
+++ b/libc/string/strchr.c
@@ -38,6 +38,6 @@
 			return((char *)p);
 		if (!*p)
 			return((char *)NULL);
-  }
+	}
 	/* NOTREACHED */
 }