libfmjni: Resolve fread assignment to condition cast

 * libfm_jni/ConfFileParser.cpp:480:21:
    error: using the result of an assignment
    as a condition without parentheses

Change-Id: Ib9526734ec96e029f89801ec9b008296a7e2c0fc
diff --git a/ConfFileParser.cpp b/ConfFileParser.cpp
index 5897992..04c9c0d 100644
--- a/ConfFileParser.cpp
+++ b/ConfFileParser.cpp
@@ -477,7 +477,7 @@
   unsigned int i;
   bool has_carriage_rtn = false;
 
-  while (bytes_read = fread(buf, 1, MAX_LINE_LEN, fp)) {
+  while ((bytes_read = fread(buf, 1, MAX_LINE_LEN, fp))) {
         for (i = 0; i < bytes_read; i++) {
             if (line_len == line_allocated) {
                 line_allocated += 25;