Update brace style.

Add braces around single-line blocks, and remove line breaks before
function-opening braces.

This resolves #537.
diff --git a/src/bitmap.c b/src/bitmap.c
index 3d27f05..7cbc7d4 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -6,8 +6,7 @@
 #ifdef BITMAP_USE_TREE
 
 void
-bitmap_info_init(bitmap_info_t *binfo, size_t nbits)
-{
+bitmap_info_init(bitmap_info_t *binfo, size_t nbits) {
 	unsigned i;
 	size_t group_count;
 
@@ -35,14 +34,12 @@
 }
 
 static size_t
-bitmap_info_ngroups(const bitmap_info_t *binfo)
-{
+bitmap_info_ngroups(const bitmap_info_t *binfo) {
 	return (binfo->levels[binfo->nlevels].group_offset);
 }
 
 void
-bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo)
-{
+bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo) {
 	size_t extra;
 	unsigned i;
 
@@ -56,23 +53,24 @@
 	memset(bitmap, 0xffU, bitmap_size(binfo));
 	extra = (BITMAP_GROUP_NBITS - (binfo->nbits & BITMAP_GROUP_NBITS_MASK))
 	    & BITMAP_GROUP_NBITS_MASK;
-	if (extra != 0)
+	if (extra != 0) {
 		bitmap[binfo->levels[1].group_offset - 1] >>= extra;
+	}
 	for (i = 1; i < binfo->nlevels; i++) {
 		size_t group_count = binfo->levels[i].group_offset -
 		    binfo->levels[i-1].group_offset;
 		extra = (BITMAP_GROUP_NBITS - (group_count &
 		    BITMAP_GROUP_NBITS_MASK)) & BITMAP_GROUP_NBITS_MASK;
-		if (extra != 0)
+		if (extra != 0) {
 			bitmap[binfo->levels[i+1].group_offset - 1] >>= extra;
+		}
 	}
 }
 
 #else /* BITMAP_USE_TREE */
 
 void
-bitmap_info_init(bitmap_info_t *binfo, size_t nbits)
-{
+bitmap_info_init(bitmap_info_t *binfo, size_t nbits) {
 	assert(nbits > 0);
 	assert(nbits <= (ZU(1) << LG_BITMAP_MAXBITS));
 
@@ -81,27 +79,25 @@
 }
 
 static size_t
-bitmap_info_ngroups(const bitmap_info_t *binfo)
-{
+bitmap_info_ngroups(const bitmap_info_t *binfo) {
 	return (binfo->ngroups);
 }
 
 void
-bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo)
-{
+bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo) {
 	size_t extra;
 
 	memset(bitmap, 0xffU, bitmap_size(binfo));
 	extra = (BITMAP_GROUP_NBITS - (binfo->nbits & BITMAP_GROUP_NBITS_MASK))
 	    & BITMAP_GROUP_NBITS_MASK;
-	if (extra != 0)
+	if (extra != 0) {
 		bitmap[binfo->ngroups - 1] >>= extra;
+	}
 }
 
 #endif /* BITMAP_USE_TREE */
 
 size_t
-bitmap_size(const bitmap_info_t *binfo)
-{
+bitmap_size(const bitmap_info_t *binfo) {
 	return (bitmap_info_ngroups(binfo) << LG_SIZEOF_BITMAP);
 }