[doc, committed] fix -Wbad-function-cast example

[Sandra Loosemore]

I was confused by the description of -Wbad-function-cast.  It talks 
about function calls, but the malloc example looked more like a 
declaration, and IIRC it's not valid to redeclare functions from the 
standard C library with the wrong return type (or at the very least we 
shouldn't encourage doing so in an example).  After checking the 
implementation to see what the option actually does, I decided it would 
be better not to name any particular function here.

Checked in under the obvious fix rule.

-Sandra

2015-01-12  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi ([-Wbad-function-cast]): Rewrite to avoid confusing
	example.
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