Remove the empty line between function comment and prototype/body.

The patch was generated using:

for f in `find ./storage/innobase/ -type f` ; do perl -i -0pe 's/\*\/\n{2,}([^({\n]+\n[a-z0-9_]+\()/*\/\n$1/isg;' $f ; done

This will skip class methods that are indented away from column 1:
	... comment end */

	int
	method(...

Approved by:	Sunny (rb#6611)