ext4: make function ‘ext4_getfsmap_find_fixed_metadata’ static

Since function ‘ext4_getfsmap_find_fixed_metadata’ can be made static,
make it so. Remove the following gcc warning (W=1):

fs/ext4/fsmap.c:405:5: warning: no previous prototype for ‘ext4_getfsmap_find_fixed_metadata’ [-Wmissing-prototypes]

Signed-off-by: Mathieu Malaterre <[e-mail]>
Signed-off-by: Theodore Ts'o <[e-mail]>

fs/ext4/fsmap.c

···
 }
 
 /* Find all the fixed metadata in the filesystem. */
-int ext4_getfsmap_find_fixed_metadata(struct super_block *sb,
-				      struct list_head *meta_list)
+static int ext4_getfsmap_find_fixed_metadata(struct super_block *sb,
+					     struct list_head *meta_list)
 {
 	struct ext4_group_desc *gdp;
 	ext4_group_t agno;