Deallocate when I_Quit() is called instead.

src/sdl/i_system.c

@@ -2132,6 +2132,7 @@ void I_Quit(void)
 		printf("\r");
 		ShowEndTxt();
 	}
+	free(myargv); // Deallocate allocated memory
 death:
 	W_Shutdown();
 	exit(0);

src/sdl12/i_system.c

@@ -2301,6 +2301,7 @@ void I_Quit(void)
 		printf("\r");
 		ShowEndTxt();
 	}
+	free(myargv); // Deallocate allocated memory
 death:
 	W_Shutdown();
 #ifdef GP2X

src/win32/win_sys.c

@@ -771,6 +771,7 @@ void I_Quit(void)
 		ShowEndTxt(co);
 	}
 	fflush(stderr);
+	free(myargv); // Deallocate allocated memory
 	W_Shutdown();
 	exit(0);
 }