Fixed a couple of uninitialised variables

iir/Biquad.h

@@ -174,7 +174,7 @@ namespace Iir {
 
 		explicit BiquadPoleState (const Biquad& s);
 
-		double gain;
+		double gain = 1;
 	};
 
 }

iir/Layout.h

@@ -170,7 +170,7 @@ namespace Iir {
 		int m_maxPoles;
 		PoleZeroPair* m_pair;
 		double m_normalW;
-		double m_normalGain;
+		double m_normalGain = 1;
 	};
 
 //------------------------------------------------------------------------------

iir/State.h

@@ -83,10 +83,10 @@ namespace Iir {
 		}
 
 	protected:
-		double m_x2; // x[n-2]
-		double m_y2; // y[n-2]
-		double m_x1; // x[n-1]
-		double m_y1; // y[n-1]
+		double m_x2 = 0; // x[n-2]
+		double m_y2 = 0; // y[n-2]
+		double m_x1 = 0; // x[n-1]
+		double m_y1 = 0; // y[n-1]
 	};
 
 //------------------------------------------------------------------------------
@@ -127,8 +127,8 @@ namespace Iir {
 		}
 
 	private:
-		double m_v1; // v[-1]
-		double m_v2; // v[-2]
+		double m_v1 = 0; // v[-1]
+		double m_v2 = 0; // v[-2]
 	};
 
 
@@ -165,10 +165,10 @@ namespace Iir {
 		}
 
 	private:
-		double m_s1;
-		double m_s1_1;
-		double m_s2;
-		double m_s2_1;
+		double m_s1 = 0;
+		double m_s1_1 = 0;
+		double m_s2 = 0;
+		double m_s2_1 = 0;
 	};
 
 }