Fix some issues reported by Valgrind #13
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Valgrind report: ==10379== Conditional jump or move depends on uninitialised value(s) ==10379== at 0x125E62: agrep (sgrep.c:1161) ==10379== by 0x12344B: sgrep (sgrep.c:436) ==10379== by 0x119A29: exec (agrep.c:3430) ==10379== by 0x119258: agrep_search (agrep.c:3226) ==10379== by 0x119327: fileagrep_search (agrep.c:3262) ==10379== by 0x119460: fileagrep (agrep.c:3312) ==10379== by 0x11D136: main (main.c:79) ==10379== Uninitialised value was created by a stack allocation ==10379== at 0x125C24: agrep (sgrep.c:1105) Signed-off-by: Stefan Weil <sw@weilnetz.de>
There are calls of free_buf in all other code branches. Signed-off-by: Stefan Weil <sw@weilnetz.de>
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These commits fix two unrelated memory issues which were identified by Valgrind.
The duplicate free problem caused a crash and triggered my investigations.
See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=869220.