tupas: fix nil pointer dereference - plan9port - [fork] Plan 9 from user space
 (HTM) git clone git://src.adamsgaard.dk/plan9port
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       ---
 (DIR) commit 32c6e78c6c4c13b63d8dc30aa395cfcc6e686c0a
 (DIR) parent c99867c9e05dd31fce28ae16aad083e893514f5a
 (HTM) Author: David du Colombier <0intro@gmail.com>
       Date:   Thu,  5 Jun 2014 18:46:28 +0200
       
       upas: fix nil pointer dereference
       
       R=rsc
       https://codereview.appspot.com/92650043
       
       Diffstat:
         M src/cmd/upas/smtp/smtp.c            |       4 ++--
       
       1 file changed, 2 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/src/cmd/upas/smtp/smtp.c b/src/cmd/upas/smtp/smtp.c
       t@@ -229,7 +229,7 @@ threadmain(int argc, char **argv)
                for(i = 0; i < argc; i++){
                        if((trv = rcptto(argv[i])) != 0){
                                /* remember worst error */
       -                        if(strcmp(rv, Giveup) != 0)
       +                        if(rv != nil && strcmp(rv, Giveup) != 0)
                                        rv = trv;
                                errs[rcvrs] = strdup(s_to_c(reply));
                                removenewline(errs[rcvrs]);
       t@@ -241,7 +241,7 @@ threadmain(int argc, char **argv)
                }
        
                /* if no ok rcvrs or worst error is retry, give up */
       -        if(ok == 0 || strcmp(rv, Retry) == 0)
       +        if(ok == 0 || (rv != nil && strcmp(rv, Retry) == 0))
                        goto error;
        
                if(ping){