reformat parameters of gdb/psymtab.c::recursively_search_psymtabs

This is just to make sure one of the parameters doesn't end past
the 80 characters limit. And while at it, since all parameters were
on their own line except the first two that were listed on the same
line, it felf more consistent to just split them to have each and
every parameter on their own line.

gdb/ChangeLog:

        * psymtab.c (recursively_search_psymtabs): Reformat parameters
        to avoid exceeding 80 characters per line limit.

Tested by rebuilding GDB on x86_64-linux.