[patch]: Fix memory leak of c-exp.y

[teawater]

c-exp.y has a memory leak in function parse_number. char *s is malloc
at line 1211.
There are returns at lines 1137, 1147, and 1157 without calling free.
This patch is for the GDB CVS version.

ChangeLog:
	* gdb/c-exp.y: Fix memory leak of function parse_number
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