GFS2: fix sparse warning: Should it be static?

Impact: Make symbol static.

Fix this sparse warning:
  fs/gfs2/rgrp.c:188:5: warning: symbol 'gfs2_bitfit' was not declared. Should it be static?

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

@@ -185,7 +185,8 @@ static inline u64 gfs2_bit_search(const __le64 *ptr, u64 mask, u8 state)
  * Return: the block number (bitmap buffer scope) that was found
  */
 
-u32 gfs2_bitfit(const u8 *buf, const unsigned int len, u32 goal, u8 state)
+static u32 gfs2_bitfit(const u8 *buf, const unsigned int len,
+		       u32 goal, u8 state)
 {
 	u32 spoint = (goal << 1) & ((8*sizeof(u64)) - 1);
 	const __le64 *ptr = ((__le64 *)buf) + (goal >> 5);