Fix compilation warnings

src/ck_game.c

@@ -364,7 +364,7 @@ bool CK_LoadGame(FS_File fp, bool fromMenu)
 {
 	int i;
 	uint16_t cmplen, bufsize;
-	int16_t prevFuses;
+	int16_t prevFuses = 0;
 	CK_object *objprev, *objnext, *moreObj;
 	uint8_t *buf;
 

src/ck_play.c

@@ -2051,7 +2051,10 @@ void CK_NormalCamera(CK_object *obj)
 		int16_t dx, ax;
 
 		ax = ck6_smashScreenOfs[ck6_smashScreenDistance] + obj->clipRects.unitY2;
+		#pragma GCC diagnostic push
+		#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
 		deltaY += (dx - ax); // Undefined behaviour here
+		#pragma GCC diagnostic pop
 	}
 	else
 #endif

src/ck_us_2.c

@@ -830,7 +830,7 @@ bool CK_US_JoyConfMenuProc(US_CardMsg msg, US_CardItem *item)
 {
 	IN_JoyConfItem which_control;
 	int value;
-	char str[8], *spos;
+	char str[8+1], *spos;
 	int print_x, print_y;
 	static const int8_t deadzone_values[] = {
 		0, 5, 10, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, -1};
@@ -1051,8 +1051,8 @@ void USL_PlayPaddleWar(void)
 	int16_t ball_y, keen_x, comp_x, bounce_point, ball_real_x, ball_real_y;
 	int16_t old_keen_x, old_comp_x, old_ball_x, old_ball_y;
 	int16_t keen_score = 0, comp_score = 0;
-	int16_t speedup_delay, ball_x_speed;
-	int32_t start_delay;
+	int16_t speedup_delay = 10, ball_x_speed;
+	int32_t start_delay = 70;
 	uint32_t lasttime, timediff;
 	IN_ControlFrame status;
 	int16_t ball_y_speed, ball_x;

src/id_rf.c

@@ -267,7 +267,7 @@ void RF_MarkTileGraphics()
 	// WARNING: As in the original codebase, the given variable is NOT initialized.
 	// This may lead to undefined behaviors in calls to RFL_MarkTileWithSound,
 	// although they aren't reproduced in vanilla Keen 6 in practice.
-	int i;
+	int i = 0;
 	for (int tileY = 0; tileY < rf_mapHeightTiles; ++tileY)
 	{
 		for (int tileX = 0; tileX < rf_mapWidthTiles; ++tileX)