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src_sinc.c: change SHIFT_BITS sanity check into compile time assert

--- a/src/src_sinc.c

+++ b/src/src_sinc.c

@@ -38,6 +38,7 @@

 typedef int32_t increment_t ;

 typedef float	coeff_t ;

+typedef int _CHECK_SHIFT_BITS[2 * (SHIFT_BITS < sizeof (increment_t) * 8 - 1) - 1]; /* sanity check. */

 #include "fastest_coeffs.h"

 #include "mid_qual_coeffs.h"

@@ -251,13 +252,6 @@

 		converter_type == SRC_SINC_BEST_QUALITY) ;

 	assert (channels > 0) ;

 	assert (error != NULL) ;

-

-	/* Quick sanity check. */

-	if (SHIFT_BITS >= sizeof (increment_t) * 8 - 1)

-	{

-		*error = SRC_ERR_SHIFT_BITS ;

-		return NULL ;

-	}

 	if (channels > MAX_CHANNELS)

 	{