Add helper strchr_replace()
diff --git a/libkmod/libkmod-util.c b/libkmod/libkmod-util.c
index e506b52..58ba1d3 100644
--- a/libkmod/libkmod-util.c
+++ b/libkmod/libkmod-util.c
@@ -204,3 +204,13 @@
 	*value = v;
 	return 0;
 }
+
+char *strchr_replace(char *s, int c, char r)
+{
+	char *p;
+
+	for (p = s; p != NULL; p = strchr(p, c))
+		*p = r;
+
+	return s;
+}