Fix tcl error

Fix tcl error

This patch fixes the following tcl error

Running ../../../binutils-gdb/gdb/testsuite/gdb.base/break-interp.exp ...
ERROR: (DejaGnu) proc "else" does not exist.
The error code is NONE
The info on the error is:
invalid command name "else"
    while executing
"::tcl_unknown else"
    ("uplevel" body line 1)
    invoked from within
"uplevel 1 ::tcl_unknown $args"

gdb/testsuite:

2015-06-17  Yao Qi  <yao.qi@linaro.org>

	* lib/gdb.exp (get_build_id): Move braces and "else" to the same
	line.