Shellcheck 2ff fixes - farbfeld - suckless image format with conversion tools
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       ---
 (DIR) commit 1f8903d1689e5f796fbe227587081d28f864cb07
 (DIR) parent 3fa775e1dfd5dc38648f88c2f385be1f0fe45605
 (HTM) Author: FRIGN <dev@frign.de>
       Date:   Wed,  7 Sep 2016 23:10:05 +0200
       
       Shellcheck 2ff fixes
       
       I was inspired by the current discussion on dev@ to use shellcheck to
       check my scripts and thought it might be a good choice to do this for
       the 2ff script.
       Not much had to be changed, because I was careful writing it, but still
       it won't hurt to but $TMP in double quotes.
       
       Diffstat:
         M 2ff                                 |      12 ++++++------
       
       1 file changed, 6 insertions(+), 6 deletions(-)
       ---
 (DIR) diff --git a/2ff b/2ff
       @@ -5,17 +5,17 @@ if [ "$#" -ne 0 ]; then
        fi
        
        TMP=$(mktemp)
       -cat > $TMP;
       +cat > "$TMP";
        
       -FORMAT=$(file -ib $TMP | cut -d ";" -f 1);
       +FORMAT=$(file -ib "$TMP" | cut -d ";" -f 1);
        
        case "$FORMAT" in
       -    image/png)  png2ff < $TMP; ret=$? ;;
       -    image/jpeg) jpg2ff < $TMP; ret=$? ;;
       -    *) convert $TMP png:- 2>/dev/null | png2ff 2>/dev/null; ret=$? ;;
       +    image/png)  png2ff < "$TMP"; ret=$? ;;
       +    image/jpeg) jpg2ff < "$TMP"; ret=$? ;;
       +    *) convert "$TMP" png:- 2>/dev/null | png2ff 2>/dev/null; ret=$? ;;
        esac
        
       -rm $TMP;
       +rm "$TMP";
        
        if [ $ret -ne 0 ]; then
                printf "%s: failed to convert %s\n" "$0" "$FORMAT" >&2;