ext4: functions should not be declared extern

The function declarations in ext4.h are already marked extern, so it's
not necessary to do so in the .c files.

This quiets the sparse noise:

warning: function 'ext4_flush_completed_IO' with external linkage has definition
warning: function 'ext4_init_inode_table' with external linkage has definition

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 0421998..e007fec 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -1100,7 +1100,7 @@
  * inode allocation from the current group, so we take alloc_sem lock, to
  * block ext4_claim_inode until we are finished.
  */
-extern int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
+int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
 				 int barrier)
 {
 	struct ext4_group_info *grp = ext4_get_group_info(sb, group);