lejp: enable negative integers

https://github.com/warmcat/libwebsockets/issues/1957

CMakeLists.txt

@@ -327,7 +327,7 @@ set(PACKAGE "libwebsockets")
 set(CPACK_PACKAGE_NAME "${PACKAGE}")
 set(CPACK_PACKAGE_VERSION_MAJOR "4")
 set(CPACK_PACKAGE_VERSION_MINOR "0")
-set(CPACK_PACKAGE_VERSION_PATCH "18")
+set(CPACK_PACKAGE_VERSION_PATCH "19")
 set(CPACK_PACKAGE_RELEASE 1)
 set(CPACK_GENERATOR "RPM")
 set(CPACK_PACKAGE_VERSION "${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH}")

lib/misc/lejp.c

@@ -416,7 +416,7 @@ lejp_parse(struct lejp_ctx *ctx, const unsigned char *json, int len)
 			break;
 
 		case LEJP_MP_VALUE:
-			if (c >= '0' && c <= '9') {
+			if (c == '-' || (c >= '0' && c <= '9')) {
 				ctx->npos = 0;
 				ctx->dcount = 0;
 				ctx->f = 0;