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/strncat.c b/libc/string/strncat.c
index 1cb9405..c4df4f2 100644
--- a/libc/string/strncat.c
+++ b/libc/string/strncat.c
@@ -52,6 +52,6 @@
 			d++;
 		} while (--n != 0);
 		*d = 0;
-  }
+	}
 	return (dst);
 }