Use "const char *" instead of "char *" for filenames passed to functions.

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Reviewed by:
PR:

crypto/x509/x509_d2.c

@@ -82,7 +82,8 @@ int X509_STORE_set_default_paths(X509_STORE *ctx)
 	return(1);
 	}
 
-int X509_STORE_load_locations(X509_STORE *ctx, char *file, char *path)
+int X509_STORE_load_locations(X509_STORE *ctx, const char *file,
+		const char *path)
 	{
 	X509_LOOKUP *lookup;