maint: avoid syntax-check failure

* src/grep.c (grep): Lower-case the "B" in "Binary file... matches"
diagnostic that we now emit to stderr. This avoids the following
when running "make syntax-check":
  maint.mk: found capitalized error message
  make: *** [maint.mk:469: sc_error_message_uppercase] Error 1

1 files changed, 1 insertions, 1 deletions

diff --git a/src/grep.c b/src/grep.c
index 0a0c71f9..614f2038 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -1644,7 +1644,7 @@ grep (int fd, struct stat const *st, bool *ineof)
   if (binary_files == BINARY_BINARY_FILES && ! (out_quiet | suppress_errors)
       && (encoding_error_output
           || (0 <= nlines_first_null && nlines_first_null < nlines)))
-    error (0, 0, _("Binary file %s matches"), quote (input_filename ()));
+    error (0, 0, _("binary file %s matches"), quote (input_filename ()));
   return nlines;
 }