[FL-2811] Fix PVS-Studio warnings (#2142)

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>

lib/toolbox/float_tools.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+
+/** Compare two floating point numbers
+ * @param a         First number to compare
+ * @param b         Second number to compare
+ *
+ * @return          bool true if a equals b, false otherwise
+ */
+bool float_is_equal(float a, float b);
+
+#ifdef __cplusplus
+}
+#endif