Fix T75414: Incorrect masking in Color Balance modifier

Color balance factor was infinity. Clamp to +/- `FLT_MAX`

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D7884

source/blender/blenkernel/intern/sequencer.c

@@ -2315,7 +2315,9 @@ MINLINE float color_balance_fl(
     x = 0.f;
   }
 
-  return powf(x, gamma) * mul;
+  x = powf(x, gamma) * mul;
+  CLAMP(x, FLT_MIN, FLT_MAX);
+  return x;
 }
 
 static void make_cb_table_float(float lift, float gain, float gamma, float *table, float mul)