bogus newlines from diagnostics

[Richard Henderson]

E.g. gcc.dg/noncompile/label-1.c:

====
z.c: In function `a':

z.c:10: error: label `l' used but not defined
z.c: In function `d':

z.c:32: error: duplicate label `l'
z.c:31: error: `l' previously defined here
z.c: In function `e':

z.c:41: error: duplicate label `l'
====

Note the extra newline after the function opener.

I don't know when this started, but all the recent pretty-print
and diagnostic changes are yours.  Would you please fix it?


r~