Style nit - don't put space after function names

Our style is to not put a space after a function name.  I did here,
and Junio applied the patch with the incorrect formatting.  So I'm
cleaning up after myself since I noticed it upon review.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

sha1_file.c

@@ -531,7 +531,7 @@ static int check_packed_git_idx(const char *path,  struct packed_git *p)
 	return 0;
 }
 
-int open_pack_index (struct packed_git *p)
+int open_pack_index(struct packed_git *p)
 {
 	char *idx_name;
 	int ret;