MIPS/readelf: Simplify GOT[1] data availability check

MIPS/readelf: Simplify GOT[1] data availability check

Unavailable data is handled gracefully in MIPS GOT processing done by
`print_mips_got_entry', so all that is needed in special GOT[1] handling
is to verify whether data can be retrieved for the purpose of the GNU
marker check done with `byte_get'.  Remove the extra error reporting
code then, introduced with commit 75ec1fdbb797 ("Fix runtime seg-fault
in readelf when parsing a corrupt MIPS binary.") in the course of
addressing PR binutils/21344, and defer the error case to regular local
GOT entry processing.

	binutils/
	* readelf.c (process_mips_specific): Remove error reporting from
	GOT[1] processing.