ext3/balloc.c: local functions should be static

This quites the sparse noise:

warning: symbol 'ext3_trim_all_free' was not declared. Should it be static?
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: NJan Kara <jack@suse.cz>

fs/ext3/balloc.c

@@ -1924,7 +1924,8 @@ unsigned long ext3_bg_num_gdb(struct super_block *sb, int group)
  * reaches any used block. Then issue a TRIM command on this extent and free
  * the extent in the block bitmap. This is done until whole group is scanned.
  */
-ext3_grpblk_t ext3_trim_all_free(struct super_block *sb, unsigned int group,
+static ext3_grpblk_t ext3_trim_all_free(struct super_block *sb,
+					unsigned int group,
 					ext3_grpblk_t start, ext3_grpblk_t max,
 					ext3_grpblk_t minblocks)
 {