Suppress a TI compiler warning

PUBLISHED_FROM=63810a48861c6e2b3e3eb8bab981927f6f85dd40

mongoose.c

@@ -10801,9 +10801,12 @@ int sl_fs_init() {
   int ret = 1;
 #ifdef __TI_COMPILER_VERSION__
 #ifdef MG_FS_SLFS
+#pragma diag_push
+#pragma diag_suppress 169 /* Nothing we can do about the prototype mismatch. */
   ret = (add_device("SL", _MSA, fs_slfs_open, fs_slfs_close, fs_slfs_read,
                     fs_slfs_write, fs_slfs_lseek, fs_slfs_unlink,
                     fs_slfs_rename) == 0);
+#pragma diag_pop
 #endif
 #endif
   return ret;