More coverage tweaks.

main.c

@@ -465,7 +465,7 @@ static void croak(void)
 /*  Okay, he's dead.  Let's get on with it. */
 {
     if (game.numdie < 0)
-        game.numdie = 0;
+        game.numdie = 0;  // LCOV_EXCL_LINE
     const char* query = obituaries[game.numdie].query;
     const char* yes_response = obituaries[game.numdie].yes_response;
     ++game.numdie;

saveresume.c

@@ -146,7 +146,7 @@ bool is_valid(struct game_t valgame)
 
     /* Check for RNG overflow. Truncate */
     if (valgame.lcg_x >= LCG_M) {
-        valgame.lcg_x %= LCG_M;
+        valgame.lcg_x %= LCG_M; // LCOV_EXCL_LINE
     }
 
     /* Check for RNG underflow. Transpose */