Fixed a couple bugs caught by clang's static analyzer

src/modules/font/freetype/TrueTypeRasterizer.cpp

@@ -65,7 +65,7 @@ int TrueTypeRasterizer::getLineHeight() const
 
 GlyphData *TrueTypeRasterizer::getGlyphData(uint32 glyph) const
 {
-	love::font::GlyphMetrics glyphMetrics;
+	love::font::GlyphMetrics glyphMetrics = {};
 	FT_Glyph ftglyph;
 
 	// Initialize

src/modules/thread/wrap_LuaThread.cpp

@@ -46,7 +46,7 @@ int w_Thread_start(lua_State *L)
 			{
 				for (int j = i; j >= 0; j--)
 					delete args[j];
-				delete args;
+				delete[] args;
 				return luaL_argerror(L, i+2, "boolean, number, string, love type, or flat table expected");
 			}
 		}