NES: Fixed const warnings

Author: ducalex

nofrendo-go/components/nofrendo/nes/state.c

@@ -70,7 +70,7 @@ void state_setslot(int slot)
    }
 }
 
-int state_save(char* fn)
+int state_save(const char* fn)
 {
    uint8 buffer[512];
    uint8 numberOfBlocks = 0;
@@ -255,7 +255,7 @@ int state_save(char* fn)
    return -1;
 }
 
-int state_load(char* fn)
+int state_load(const char* fn)
 {
    uint8 buffer[512];
    FILE *file;

nofrendo-go/components/nofrendo/nes/state.h

@@ -32,7 +32,7 @@ typedef struct
 } SnssBlockHeader;
 
 extern void state_setslot(int slot);
-extern int state_load(char *fn);
-extern int state_save(char *fn);
+extern int state_load(const char *fn);
+extern int state_save(const char *fn);
 
 #endif /* _NESSTATE_H_ */