Minor formatting fix in breakpoint.c

I noticed a spot in breakpoint.c that doesn't follow gdb's formatting
rules: the return type is on the same line as the method name.

gdb/breakpoint.c

diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 0871585..f06c3c2 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -11867,7 +11867,8 @@ code_breakpoint::say_where () const
 
 /* See breakpoint.h.  */
 
-bp_location_range breakpoint::locations () const
+bp_location_range
+breakpoint::locations () const
 {
   return bp_location_range (m_locations.begin (), m_locations.end ());
 }