Silence some -Wswitch-default warnings.

Source/Core/Core/FifoPlayer/FifoPlayer.cpp

@@ -453,7 +453,7 @@ bool FifoPlayer::ShouldLoadBP(u8 address)
 	case BPMEM_LOADTLUT1:
 	case BPMEM_PERF1:
 		return false;
+	default:
+		return true;
 	}
-
-	return true;
 }

Source/Core/Core/PowerPC/JitILCommon/IR.cpp

@@ -974,10 +974,10 @@ static unsigned ICmpInverseOp(unsigned op)
 		return ICmpSgt;
 	case ICmpSge:
 		return ICmpSlt;
+	default:
+		PanicAlert("Bad opcode");
+		return Nop;
 	}
-
-	PanicAlert("Bad opcode");
-	return Nop;
 }
 
 InstLoc IRBuilder::FoldXor(InstLoc Op1, InstLoc Op2)

Source/Core/DolphinWX/MainNoGUI.cpp

@@ -46,12 +46,8 @@ void Host_RefreshDSPDebuggerWindow() {}
 static Common::Event updateMainFrameEvent;
 void Host_Message(int Id)
 {
-	switch (Id)
-	{
-		case WM_USER_STOP:
-			running = false;
-			break;
-	}
+	if (Id == WM_USER_STOP)
+		running = false;
 }
 
 static void* s_window_handle;

Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp

@@ -55,9 +55,10 @@ static std::string GetGLSLVersionString()
 			return "#version 140";
 		case GLSL_150:
 			return "#version 150";
+		default:
+			// Shouldn't ever hit this
+			return "#version ERROR";
 	}
-	// Shouldn't ever hit this
-	return "#version ERROR";
 }
 
 void SHADER::SetProgramVariables()

Source/Core/VideoBackends/Software/Tev.cpp

@@ -347,9 +347,8 @@ static bool AlphaCompare(int alpha, int ref, AlphaTest::CompareMode comp)
 	case AlphaTest::GREATER: return alpha > ref;
 	case AlphaTest::EQUAL:   return alpha == ref;
 	case AlphaTest::NEQUAL:  return alpha != ref;
+	default: return true;
 	}
-
-	return true;
 }
 
 static bool TevAlphaTest(int alpha)
@@ -363,8 +362,8 @@ static bool TevAlphaTest(int alpha)
 	case 1: return comp0 || comp1;   // or
 	case 2: return comp0 ^ comp1;    // xor
 	case 3: return !(comp0 ^ comp1); // xnor
+	default: return true;
 	}
-	return true;
 }
 
 static inline s32 WrapIndirectCoord(s32 coord, int wrapMode)
@@ -385,8 +384,9 @@ static inline s32 WrapIndirectCoord(s32 coord, int wrapMode)
 			return (coord % (16 << 7));
 		case ITW_0:
 			return 0;
+		default:
+			return 0;
 	}
-	return 0;
 }
 
 void Tev::Indirect(unsigned int stageNum, s32 s, s32 t)

Source/Core/VideoCommon/BPMemory.h

@@ -959,6 +959,9 @@ union AlphaTest
 			if ((comp0 == ALWAYS && comp1 == ALWAYS) || (comp0 == NEVER && comp1 == NEVER))
 				return PASS;
 			break;
+
+		default:
+			return UNDETERMINED;
 		}
 		return UNDETERMINED;
 	}

Source/Core/VideoCommon/TextureDecoder_Common.cpp

@@ -571,6 +571,9 @@ void TexDecoder_DecodeTexel(u8 *dst, const u8 *src, int s, int t, int imageWidth
 				case 7:
 					color = MakeRGBA(red2, green2, blue2, 0);
 					break;
+				default:
+					color = 0;
+					break;
 			}
 
 			*((u32*)dst) = color;