Merge pull request #1640 from rohit-n/switch-default

Silence some -Wswitch-default warnings.

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;