Currently, diffcore-pickaxe reports two distinct errors for the same
user error:

    $ git log --pickaxe-regex -S'\1'
    fatal: invalid pickaxe regex: Invalid back reference

    $ git log -G'\1' # --pickaxe-regex is implied
    fatal: invalid log-grep regex: Invalid back reference

Since the error has nothing to do with "log-grep", change the -G and -S
error messages to say "invalid regex".

Signed-off-by: Ramkumar Ramachandra <artag...@gmail.com>
---
 diffcore-pickaxe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 63722f8..c97ac9b 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -122,7 +122,7 @@ static void diffcore_pickaxe_grep(struct diff_options *o)
                char errbuf[1024];
                regerror(err, &regex, errbuf, 1024);
                regfree(&regex);
-               die("invalid log-grep regex: %s", errbuf);
+               die("invalid regex: %s", errbuf);
        }
 
        pickaxe(&diff_queued_diff, o, &regex, NULL, diff_grep);
@@ -246,7 +246,7 @@ static void diffcore_pickaxe_count(struct diff_options *o)
                        char errbuf[1024];
                        regerror(err, &regex, errbuf, 1024);
                        regfree(&regex);
-                       die("invalid pickaxe regex: %s", errbuf);
+                       die("invalid regex: %s", errbuf);
                }
                regexp = &regex;
        } else {
-- 
1.8.3.114.gcd03571

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