[bug #68560] [PATCH] [grops] ASAN reports 1-byte heap overread with certain invalid `import` device extension command arguments

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Follow-up Comment #2, bug #68560 (group groff):=0A=0AThe quoted fix also ma=
kes the error diagnostics more intelligible.=0A=0A=0A$ ../src/devices/grops=
/tests/device-extension-command-import-works.sh=0A>/dev/null=0Achecking tha=
t 'ps: import' device extension command works=0A./grops:<standard input>:17=
: error: invalid argument 'a 203b 311c 408d 481e=0A144000f 119415g' to devi=
ce extension command 'import'=0A./grops:<standard input>:18: error: invalid=
 numeric argument(s) 'a' to device=0Aextension command 'import'=0A=0A=0A=0A=
=0A    _______________________________________________________=0A=0AReply t=
o this item at:=0A=0A  <https://savannah.gnu.org/bugs/?68560>=0A=0A________=
_______________________________________=0AMessage sent via Savannah=0Ahttps=
://savannah.gnu.org/=0A
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