Added GitHub Action to test for clang-format.
diff --git a/upb/json_encode.c b/upb/json_encode.c
index a247078..e0b35f1 100644
--- a/upb/json_encode.c
+++ b/upb/json_encode.c
@@ -162,7 +162,7 @@
* Fliegel, H. F., and Van Flandern, T. C., "A Machine Algorithm for
* Processing Calendar Dates," Communications of the Association of
* Computing Machines, vol. 11 (1968), p. 657. */
- seconds += 62135596800; // Ensure seconds is positive.
+ seconds += 62135596800; // Ensure seconds is positive.
L = (int)(seconds / 86400) - 719162 + 68569 + 2440588;
N = 4 * L / 146097;
L = L - (146097 * N + 3) / 4;